On 27/03/17 13:00, J. Hart wrote: > That is a very interesting idea. I'll try some experiments with this.
You might want to look into two tools which I have found useful for similar backups: 1) rsnapshot -- this uses rsync for backing up multiple systems and has been stable for quite a long time. If the target disk is btrfs it is fairly easy to configure so that it uses btrfs snapshots to create and remove the snapshot directories, speeding up the process. This doesn't really use any complex btrfs features and has been stable for me even on my Debian stable (kernel 3.16.39) system. 2) btrbk -- this allows you to create and manage btrfs snapshots on the source disk as well as backup snapshots on a separate btrfs disk. You can separately control how many snapshots you keep online on both the source and the backup disk. This is particularly useful for cases where you want to take very frequent snapshots (say hourly) for which rsync may be too slow (and rsync does not take a consistent snapshot, of course). There are many other tools, of course (I also take daily backups with dar to an ext4 system, without using any btrfs features at all, just in case a new version of btrfs suddenly decided to correct all copies of IHATEBTRFS on the disk to ILOVEBTRFS, for example :-) ). Graham Note to self: re-read this message periodically to check that feature hasn't appeared yet. -- To unsubscribe from this list: send the line "unsubscribe linux-btrfs" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
