Command sync

How much would the next add write? sync estimates it.

Quick summary

sync compares the content of an archive with folders on the filesystem, and estimates the size of new/changed data to be compressed.

Power user usage

• -quick compare only file sizes (skip the hashes)
• -ssd multithreaded hashing

Lo spiegone

Dispatched as command I to sync().

Real-world examples

An archive with 3 folders, then check all of them

zpaqfranz a z:\1.zpaq c:\zpaqfranz c:\nz c:\ut
zpaqfranz sync z:\1.zpaq c:\zpaqfranz c:\nz c:\ut

Multithread; size only

zpaqfranz sync z:\1.zpaq c:\nz -ssd
zpaqfranz sync z:\1.zpaq c:\nz -quick