On 10/12/2023 07:09:35 PM, Neil Bothwick wrote:
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
Thanks Neil,
unfortunately my root FS is of type ext4, only my backup FS is of type
BTRFS
Helmut
