On Sat, Jun 8, 2024 at 4:35 PM Philip Rhoades via users < users@lists.fedoraproject.org> wrote:
[...] What I don't understand is that when creating the snapshots originally, the time to create them is almost zero but when using btrfs send to the other partition the times are _much_ longer. I guess it makes sense that the first send of the first snapshot is slow, but why are the second and third sends not much better?
Creating a snapshot only maniplates meta-data to mark blocks that should be preserved (so they can be used if you need to roll back to a snapshot).
My previous script using rsync for incremental backups of a file system / dir is faster - I can check the times if anyone is interested . .
rsync should be faster: send has to use the metadata to resconstruct the
files while rsync uses the current filesystem which is highly optimimized to take advantage of caches and parallel operations.