

And snapshot can benefit backup. Since some software need to be shudown to do backup, minimize the down time is important. The snapshot can make down time is almost stop and restart time, and the software can be online again and we can do backup on snapshot in background.
He may want to say “fastsync” (whose kernel part called winesync). It’s the predecessor of NTsync and was renamed to NTsync when merged into linux mainline.
Before NTsync was merged, those distrobutions provides the kernel packages with winesync patches. Since linux 6.12, NTsync was merged so they droped winesync from kernel package. But NTsync’s API is different with fastsync/winesync, so old wine with fastsync support will stop working with new kernel. (While NTsync still isn’t merged to wine)