Starting from build 758, you can enable server-side cache in Syncrify, which only affects back ups where the direction is Server-to-Client. Using this cache you can significantly reduce the time it takes to run a backup where the direction is Server-to-Client.
Syncrify server keeps track of the files that have been modified through a backup job. When a client runs a backup in Server-to-client direction, server sends a list of files that were touched since its last backup. This way, the client only pulls files that were modified on the server recently.
This cache is ignored when clients runs backup on a specific folder - meaning they select a desired folder in Syncrify client application, click the right mouse button and select Synchronize / Selected Folder