On Sat, Jan 17, 2015 at 01:03:20PM +0100, G EO wrote: > I know I have discussed it already on this list, but unfortunately it > did no work out for me. > I am creating backups with btrfs send/receive, like described on the > wiki page https://btrfs.wiki.kernel.org/index.php/Incremental_Backup. > > That means I have a subvolume "home", create a snapshot > "home-snapshot" and send it to the backup drive. Then the following > times I create another snapshot "home-snapshot-1" and send the > difference to the backup drive using "btrfs send -p home-snapshot > home-snapshot-1 | btrfs receive /path". For that to work I always need > to keep the last local reference (like home-snapshot) in this example. > > Now I am in the unfortunate situation that I deleted the local > reference accidentally out of my own stupidity and wonder if there is > a way to determine the difference between the last snapshot on the > backup drive and the state of my sub-volume now.
I think the short answer is, no, there isn't any way of doing it. Hugo. > I tried the following: I sent the last snapshot (in this example > home-snapshot-1) on the backup drive to an empty btrfs filesystem. > Then I created a read/write snapshot of this one > (home-snapshot-1-snap) and copied my whole current subvolume to the > read/write snapshot in the hope btrfs would only writes changes, but > that was hopeless, when sending the "diff -p" between the imported > snapshot (home-snapshot-1) and the read write snapshot > (home-snapshot-1-snap) back to the backup drive, it did not send any > differences but the whole subvolume (home-snapshot-1-snap). > > So is there any way I can let compute the differences in order to > restore the old situation and continue with my incremental backups? > > For information: I do not have any older local snapshots :-(, all of > the snapshot were deleted because of a regex problem in a script I > ran. -- Hugo Mills | Debugging is like hitting yourself in the head with hugo@... carfax.org.uk | hammer: it feels so good when you find the bug, and http://carfax.org.uk/ | you're allowed to stop debugging. PGP: 65E74AC0 | PotatoEngineer
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