diff --git a/src/swell/configuration/jedi/interfaces/geos_marine/model/r2d2.py b/src/swell/configuration/jedi/interfaces/geos_marine/model/r2d2.py
index 53b104454..256089658 100644
--- a/src/swell/configuration/jedi/interfaces/geos_marine/model/r2d2.py
+++ b/src/swell/configuration/jedi/interfaces/geos_marine/model/r2d2.py
@@ -28,14 +28,15 @@ def r2d2(template_dict: Mapping) -> Mapping:
                         'file_extension': 'tar.gz',
                         'filename': f'{cycle_dir}/cice.res.{local_background_time}.nc'})
 
-    an_list = [{'file_type': 'ocn.incr',
+    an_list = [{'file_type': 'ocn.an',
                 'r2d2_model': 'mom6',
-                'filename': f'{cycle_dir}/mom6_increment.nc'}]
+                # 'filename': f'{cycle_dir}/mom6_increment.nc'}]
+                'filename': f'{cycle_dir}/ocn.{experiment_id}.an.{analysis_time_iso}.nc'}]
 
     if 'cice6' in template_dict['marine_models']:
-        an_list.append({'file_type': 'ice.incr',
+        an_list.append({'file_type': 'ice.an',
                         'r2d2_model': 'cice6',
-                        'filename': f'{cycle_dir}/ice.{experiment_id}.incr.{analysis_time_iso}.nc'})
+                        'filename': f'{cycle_dir}/ice.{experiment_id}.an.{analysis_time_iso}.nc'})
 
     r2d2 = {
         'fetch': {
diff --git a/src/swell/suites/3dfgat_marine_cycle/flow.cylc b/src/swell/suites/3dfgat_marine_cycle/flow.cylc
index a36d54a43..15be3f5fb 100644
--- a/src/swell/suites/3dfgat_marine_cycle/flow.cylc
+++ b/src/swell/suites/3dfgat_marine_cycle/flow.cylc
@@ -103,14 +103,17 @@
             {% endif %}
 
             # Move restart to next cycle and then erase current forecast folder
-            SaveRestart-{{model_component}} => MoveDaRestart-{{model_component}} => CleanCycle-{{model_component}}
+            SaveRestart-{{model_component}} => MoveDaRestart-{{model_component}} d
 
             {% if not skip_r2d2 %}
-            # Compress forecast on compute node, then store in R2D2 on login node
-            LinkCoupledGeosOutput-{{model_component}} => RunCompressForecast-{{model_component}} => SaveForecast-{{model_component}} => MoveDaRestart-{{model_component}}
-            RunJediFgatExecutable-{{model_component}} => SaveObsDiags-{{model_component}} => CleanCycle-{{model_component}}
+            # Compress forecast on compute node, then save in R2D2 on login node; (state space) forecast, analysis, and (obs space) observation outputs.
+            LinkCoupledGeosOutput-{{model_component}} => SaveForecast-{{model_component}} => MoveDaRestart-{{model_component}}
+            RunJediFgatExecutable-{{model_component}} => SaveAnalysis-{{model_component}} => MoveDaRestart-{{model_component}}
+            RunJediFgatExecutable-{{model_component}} => SaveObsDiags-{{model_component}} => MoveDaRestart-{{model_component}}
             {% endif %}
 
+            MoveDaRestart-{{model_component}} => CleanCycle-{{model_component}}
+
             # Clean up large files
             EvaObservations-{{model_component}} & EvaJediLog-{{model_component}} & EvaIncrement-{{model_component}} =>
             CleanCycle-{{model_component}}
@@ -243,6 +246,9 @@
             --{{key}} = {{value}}
         {%- endfor %}
 
+    [[SaveAnalysis-{{model_component}}]]
+        script = "swell task SaveAnalysis $config -d $datetime -m {{model_component}}"
+
     [[RunCompressForecast-{{model_component}}]]
         script = "swell task RunCompressForecast $config -d $datetime -m {{model_component}}"
         platform = {{platform}}
diff --git a/src/swell/suites/3dvar_marine_cycle/flow.cylc b/src/swell/suites/3dvar_marine_cycle/flow.cylc
index d7619156a..26b1c5532 100644
--- a/src/swell/suites/3dvar_marine_cycle/flow.cylc
+++ b/src/swell/suites/3dvar_marine_cycle/flow.cylc
@@ -105,9 +105,10 @@
             SaveRestart-{{model_component}} => MoveDaRestart-{{model_component}} => CleanCycle-{{model_component}}
 
             {% if not skip_r2d2 %}
-            # Compress forecast on compute node, then store in R2D2 on login node
-            LinkCoupledGeosOutput-{{model_component}} => RunCompressForecast-{{model_component}} => SaveForecast-{{model_component}} => MoveDaRestart-{{model_component}}
-            RunJediVariationalExecutable-{{model_component}} => SaveObsDiags-{{model_component}} => CleanCycle-{{model_component}}
+            # Compress forecast on compute node, then save in R2D2 on login node; (state space) forecast, analysis, and (obs space) observation outputs.
+            LinkCoupledGeosOutput-{{model_component}} => SaveForecast-{{model_component}} => MoveDaRestart-{{model_component}}
+            RunJediVariationalExecutable-{{model_component}} => SaveAnalysis-{{model_component}} => MoveDaRestart-{{model_component}}
+            RunJediVariationalExecutable-{{model_component}} => SaveObsDiags-{{model_component}} => MoveDaRestart-{{model_component}}
             {% endif %}
 
             # Clean up large files
@@ -251,15 +252,18 @@
             --{{key}} = {{value}}
         {%- endfor %}
 
+    [[SaveAnalysis-{{model_component}}]]
+        script = "swell task SaveAnalysis $config -d $datetime -m {{model_component}}"
+
     [[SaveForecast-{{model_component}}]]
         script = "swell task SaveForecast $config -d $datetime -m {{model_component}}"
 
-    [[SaveRestart-{{model_component}}]]
-        script = "swell task SaveRestart $config -d $datetime -m {{model_component}}"
-
     [[SaveObsDiags-{{model_component}}]]
         script = "swell task SaveObsDiags $config -d $datetime -m {{model_component}}"
 
+    [[SaveRestart-{{model_component}}]]
+        script = "swell task SaveRestart $config -d $datetime -m {{model_component}}"
+
     [[PrepareAnalysis-{{model_component}}]]
         script = "swell task PrepareAnalysis $config -d $datetime -m {{model_component}}"
 
diff --git a/src/swell/tasks/get_background.py b/src/swell/tasks/get_background.py
index afb92f1d1..850accc27 100644
--- a/src/swell/tasks/get_background.py
+++ b/src/swell/tasks/get_background.py
@@ -84,7 +84,7 @@ def execute(self) -> None:
         # Get window parameters
         local_background_time = self.da_window_params.local_background_time(window_length,
                                                                             window_type)
-        analysis_time_iso = self.da_window_params.analysis_time_iso()
+        analysis_time_iso, _ = self.da_window_params.analysis_time_iso()
 
         # Add to jedi config rendering dictionary
         self.jedi_rendering.add_key('local_background_time', local_background_time)
diff --git a/src/swell/tasks/run_jedi_convert_state_soca2cice_executable.py b/src/swell/tasks/run_jedi_convert_state_soca2cice_executable.py
index 297f0bfb3..e1d66a041 100644
--- a/src/swell/tasks/run_jedi_convert_state_soca2cice_executable.py
+++ b/src/swell/tasks/run_jedi_convert_state_soca2cice_executable.py
@@ -33,10 +33,10 @@ def execute(self) -> None:
         window_type = self.config.window_type()
         window_length = self.config.window_length()
 
-        # Compute data assimilation window parameters
-        # --------------------------------------------
-        analysis_time = self.da_window_params.analysis_time()
-        analysis_time_iso = self.da_window_params.analysis_time_iso()
+        # Compute data assimilation window parameters, some methods return dto, which may not be needed here
+        # -----------------------------------------------------------------------------
+        analysis_time, _ = self.da_window_params.analysis_time()
+        analysis_time_iso, _ = self.da_window_params.analysis_time_iso()
         local_background_time = self.da_window_params.local_background_time(window_length,
                                                                             window_type)
         local_background_time_iso = self.da_window_params.local_background_time_iso(window_length,
diff --git a/src/swell/tasks/save_analysis.py b/src/swell/tasks/save_analysis.py
new file mode 100644
index 000000000..d1c269dcb
--- /dev/null
+++ b/src/swell/tasks/save_analysis.py
@@ -0,0 +1,185 @@
+# (C) Copyright 2021- United States Government as represented by the Administrator of the
+# National Aeronautics and Space Administration. All Rights Reserved.
+#
+# This software is licensed under the terms of the Apache Licence Version 2.0
+# which can be obtained at http://www.apache.org/licenses/LICENSE-2.0.
+
+
+# --------------------------------------------------------------------------------------------------
+
+
+from datetime import datetime as dt
+import isodate
+import os
+from r2d2 import store
+
+from swell.tasks.base.task_base import taskBase
+from swell.utilities.datetime_util import datetime_formats
+from swell.utilities.r2d2 import load_r2d2_credentials
+
+
+# --------------------------------------------------------------------------------------------------
+
+class SaveAnalysis(taskBase):
+
+    # ----------------------------------------------------------------------------------------------
+
+    def execute(self) -> None:
+
+        """Store analysis files for a given experiment and cycle in R2D2.
+
+            Analysis files are handled differently then forecast files in R2D2, as they are stored
+            at their exact valid time (the analysis time).
+
+            Additionally, for 4D/FGAT windows, all analyses within the window are stored, each at its own valid time,
+            rather than just the window-begin forecast as in the SaveForecast task.
+
+            The marine FGAT only calculates one analysis and increment file per model (i.e., mom6 and cice6), 
+            valid at the local background time.
+
+           Parameters
+           ----------
+             All inputs are extracted from the JEDI experiment file configuration.
+             See the taskBase constructor for more information.
+        """
+
+        # Parse common configuration as instance variables
+        # -------------------------------------------------
+        self.marine_models = self.config.marine_models(None) or []
+        self.window_type = self.config.window_type()
+        self.window_length = self.config.window_length()
+        self.window_begin_iso = self.da_window_params.window_begin_iso(self.window_length)
+        self.background_experiment = self.experiment_id()
+        self.horizontal_resolution = self.config.horizontal_resolution()
+
+        # Load R2D2 credentials
+        # ---------------------
+        load_r2d2_credentials(self.logger, self.platform())
+
+        self.local_background_time, self.local_background_time_dto = self.da_window_params.local_background_time(
+            self.window_length,
+            self.window_type,
+            dto=True)
+
+        analysis_time_iso, analysis_time_dto = self.da_window_params.analysis_time_iso()
+
+        # Populate jedi_rendering template dictionary before rendering
+        # (mirrors run_jedi_variational_executable.py)
+        # ------------------------------------------------------------
+        local_background_time_iso = self.da_window_params.local_background_time_iso(
+            self.window_length, self.window_type)
+
+        self.jedi_rendering.add_key('local_background_time', self.local_background_time)
+        self.jedi_rendering.add_key('local_background_time_iso', local_background_time_iso)
+        self.jedi_rendering.add_key('marine_models', self.marine_models)
+        self.jedi_rendering.add_key('horizontal_resolution', self.horizontal_resolution)
+        self.jedi_rendering.add_key('analysis_time_iso', analysis_time_iso)
+
+        # Render r2d2 interface dict once, shared by all store methods
+        # -------------------------------------------------------------
+        self.r2d2_dict = self.jedi_rendering.render_interface_model('r2d2')
+
+        # Dispatch to model- and window-type-specific store methods
+        # ----------------------------------------------------------
+        model_component = self.get_model()
+
+        if model_component == 'geos_atmosphere':
+            if is_4d:
+                self.store_atmosphere_4d()
+            else:
+                self.store_atmosphere_3d()
+
+        elif model_component == 'geos_marine':
+            marine_model_configs = [('mom6', 'ocn_filename', 'ocn.an')]
+            if 'cice6' in self.marine_models:
+                marine_model_configs.append(('cice6', 'ice_filename', 'ice.an'))
+
+            for model_name, filename_key, file_type in marine_model_configs:
+                self._store_an_dict(model_name, analysis_time_dto)
+
+        else:
+            self.logger.abort(f'Unknown model component for SaveAnalysis: {model_component}')
+
+    # ----------------------------------------------------------------------------------------------
+
+    def _store_analysis(self,
+                        model_name: str,
+                        ana_dto: dt,
+                        source_file: str,
+                        file_type: str,
+                        ) -> None:
+        """Call r2d2.store for a single analysis file at its exact valid time.
+
+        Parameters
+        ----------
+        model_name : str
+            R2D2 model identifier (e.g. 'geos', 'mom6', 'cice6', 'geos_cf').
+        ana_dto : datetime
+            Valid datetime of the analysis file (used directly as the r2d2 date).
+        source_file : str
+            Absolute path to the analysis file to store.
+        file_type : str
+            R2D2 file_type label (e.g. 'MOM.res', 'cice.res', 'bkg').
+        """
+
+        file_extension = file_type.split('.')[-1] if '.' in file_type else 'nc'
+
+        self.logger.info(f'Storing {os.path.basename(source_file)} '
+                         f'at {ana_dto.strftime(datetime_formats["iso_format"])}')
+
+        # store(
+        #     item='analysis',
+        #     model=model_name,
+        #     experiment=self.background_experiment,
+        #     resolution=self.horizontal_resolution,
+        #     date=ana_dto.strftime('%Y-%m-%d %H:%M:%S'),
+        #     source_file=source_file,
+        #     file_type=file_type,
+        #     file_extension=file_extension,
+        # )
+
+    # ----------------------------------------------------------------------------------------------
+
+    def _store_an_dict(self, model_name: str, ana_dto: dt) -> None:
+        """Store all analyses defined in r2d2_dict['store']['an'] for one datetime.
+
+        The filename for each entry is resolved by applying strftime to ana_dto,
+        ensuring it works for both static (marine, already strftime-compatible) and
+        datetime-templated (atmosphere) filename patterns.
+
+        Parameters
+        ----------
+        model_name : str
+            R2D2 model identifier.
+        ana_dto : datetime
+            Valid datetime of the analysis — used as the r2d2 date and for filename resolution.
+        """
+
+        for an in self.r2d2_dict['store']['an']:
+            if an.get('r2d2_model') != model_name:
+                continue
+            file_type = an['file_type']
+            source_file = ana_dto.strftime(an['filename'])
+            self._store_analysis(model_name, ana_dto, source_file, file_type)
+
+    # ----------------------------------------------------------------------------------------------
+    # Atmosphere store methods (not implemeted yet, will need to resolve datetime-templated filenames for each analysis within the window)
+    # ----------------------------------------------------------------------------------------------
+
+    def store_atmosphere_3d(self) -> None:
+        """Store a single atmospheric analysis at the middle of a 3D window."""
+
+        self.logger.abort('Storing the window-begin atmospheric analysis is not ready yet.')
+
+    # ----------------------------------------------------------------------------------------------
+
+    def store_atmosphere_4d(self) -> None:
+        """Store atmospheric analyses across a 4D (or FGAT) window.
+
+        Uses states_generator to enumerate valid analysis datetimes and stores
+        each file, keyed by its exact valid time.
+        """
+
+        self.logger.abort('Storing the window-begin atmospheric analysis is not ready yet.')
+
+# --------------------------------------------------------------------------------------------------
diff --git a/src/swell/tasks/task_questions.py b/src/swell/tasks/task_questions.py
index 71fca1608..b858e3a82 100644
--- a/src/swell/tasks/task_questions.py
+++ b/src/swell/tasks/task_questions.py
@@ -664,6 +664,18 @@ class TaskQuestions(QuestionContainer, Enum):
 
     # --------------------------------------------------------------------------------------------------
 
+    RunCompressForecast = QuestionList(
+        list_name="RunCompressForecast",
+        questions=[
+            window_questions,
+            qd.r2d2_experiment_id(),
+            qd.background_frequency(),
+            qd.horizontal_resolution(),
+        ]
+    )
+
+    # --------------------------------------------------------------------------------------------------
+
     RunJediConvertStateSoca2ciceExecutable = QuestionList(
         list_name="RunJediConvertStateSoca2ciceExecutable",
         questions=[
@@ -851,18 +863,6 @@ class TaskQuestions(QuestionContainer, Enum):
 
     # --------------------------------------------------------------------------------------------------
 
-    RunCompressForecast = QuestionList(
-        list_name="RunCompressForecast",
-        questions=[
-            window_questions,
-            qd.r2d2_experiment_id(),
-            qd.background_frequency(),
-            qd.horizontal_resolution(),
-        ]
-    )
-
-    # --------------------------------------------------------------------------------------------------
-
     RunJediEdaExecutable = QuestionList(
         list_name="RunJediEdaExecutable",
         questions=[
@@ -877,6 +877,18 @@ class TaskQuestions(QuestionContainer, Enum):
 
     # --------------------------------------------------------------------------------------------------
 
+    SaveAnalysis = QuestionList(
+        list_name="SaveAnalysis",
+        questions=[
+            window_questions,
+            qd.r2d2_experiment_id(),
+            qd.background_experiment(),
+            qd.horizontal_resolution(),
+        ]
+    )
+
+    # --------------------------------------------------------------------------------------------------
+
     SaveForecast = QuestionList(
         list_name="SaveForecast",
         questions=[
@@ -887,6 +899,7 @@ class TaskQuestions(QuestionContainer, Enum):
             ]
         )
 
+
     # --------------------------------------------------------------------------------------------------
 
     SaveForecastCf = QuestionList(
diff --git a/src/swell/utilities/data_assimilation_window_params.py b/src/swell/utilities/data_assimilation_window_params.py
index 454cbefd2..79710e364 100644
--- a/src/swell/utilities/data_assimilation_window_params.py
+++ b/src/swell/utilities/data_assimilation_window_params.py
@@ -101,17 +101,31 @@ def __get_analysis_time__(self) -> datetime.datetime:
 
     # ----------------------------------------------------------------------------------------------
 
-    def analysis_time(self) -> str:
+    def analysis_time(self) -> Tuple[str, datetime.datetime]:
+        """Get the analysis time for the current cycle.
+
+        Returns
+        -------
+        Tuple[str, datetime.datetime]
+            A tuple containing the analysis time formatted as a string and the corresponding datetime object.
+        """
 
         analysis_time_dto = self.__get_analysis_time__()
-        return analysis_time_dto.strftime(datetime_formats['directory_format'])
+        return analysis_time_dto.strftime(datetime_formats['directory_format']), analysis_time_dto
 
     # ----------------------------------------------------------------------------------------------
 
-    def analysis_time_iso(self) -> str:
+    def analysis_time_iso(self) -> Tuple[str, datetime.datetime]:
+        """Get the analysis time for the current cycle in ISO format.
+
+        Returns
+        -------
+        Tuple[str, datetime.datetime]
+            A tuple containing the analysis time formatted as an ISO string and the corresponding datetime object.
+        """
 
         analysis_time_dto = self.__get_analysis_time__()
-        return analysis_time_dto.strftime(datetime_formats['iso_format'])
+        return analysis_time_dto.strftime(datetime_formats['iso_format']), analysis_time_dto
 
     # ----------------------------------------------------------------------------------------------