On Thu, 12 Oct 2023 18:54:10 +0200, Helmut Jarausch wrote: > from time to time - as was the case a few days ago - Gentoo updates > lead to an unbootable system. > I backup my system each day - using BTRFS snapshots. > > Now, only a few files on current system have changed; the rest of the > 400 GB root partition is unchanged. > Therefore I only have to replace these newer files by the versions > saved a day before. > > How can this be done efficiently? Unfortunately AFAIK rsync doesn't > have an option to copy only files which are > NEWER on the destination than the corresponding files in the backup.
You can replace the original root subvolume with the snapshot. One way of doiing it is detailed at https://unix.stackexchange.com/questions/19211/how-to-create-a-snapshot-in-btrfs-and-then-rollback-to-it-after-some-work -- Neil Bothwick Bang on the LEFT side of your computer to restart Windows
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