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 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. -- 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
