On 19 Jan 2022, Wols Lists said: > Oh well, the good thing is that backup drive is on its way. I'm planning to put plain lvm on it, and write a bunch of services that > create backup volumes then do a overwrite-in-place rsync. So as I keep advising > people, it does an incremental backup, but the COW volumes mean I have full backups. rsync works by rename-then-rewrite on a whole-file basis (it doesn't just modify changed bits of files), so I'm afraid it's going to be terribly inefficient for large slightly-changed files, with many unchanging blocks CoWed nonetheless. The right way to do a deduplicating backup is to use a deduplicating backup system (borg, restic, bup, bupstash -- I swear by bup myself). There's a really good list here: <https://github.com/restic/others>. -- NULL && (void)
