Re: [gentoo-user] How to replay a backup system?
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
Re: [gentoo-user] How to replay a backup system?
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 pgpmRa5BmY4at.pgp Description: OpenPGP digital signature
[gentoo-user] How to replay a backup system?
Hi, 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. Many thanks for a hint, Helmut
