Hello and thanks for the replies all, Le 04/09/2019 à 22:48, Chris Murphy a écrit : > If you want an exact copy, including all of the exact UUIDs, yes.
No I don"t really care about the UUIDs, and it's the only thing I don't care about. My use case is rather taking a full and complete copy of my NAS BTRFS RAID-5 storage space onto an external, eventually big, disk, or some other RAID combination in case something would go wrong - in a way that I could get everything backed up and restored easily. So far and for years I found BTRFS to be extremely reliable and resilient in all configurations, but I've had several issues with recent 5.1 and 5.2 kernels on several machines recently . My NAS holds a number of subvols for many different purposes, most of them contains a hosts of RO snaphots made either manually or automatically using snapper, and everything is offline-deduped using bees (as there is a *lot* of redundant copies of the same files in different subvols and structures). Of course I cannot just “dd” as I don't start from a single device but a BTRFS RAID, and I'm afraid that any manual scheme that I could think of would break deduplication and thus result in a huge output that wouldn't fit any device I could think of. So the question reslly is : How could I backup a complex BTRFS volume to another but differently (physically) organized volume keeping the complete structure and being able to restore it preferably in a single operation. If the answer is « There's no way it can be done » then it is really badly annoying... ॐ -- Swâmi Petaramesh <sw...@petaramesh.org> PGP 9076E32E
