Ebből a kategóriából nekem a kedvencem eddig (nagyon nem kerestem, de úgy éreztem diszkréten utánaolvasok mielőtt a backup-okat btrfs-re teszem):
" Using btrfs replace
When you have a device that's in the process of failing or has failed in a RAID array you should use the btrfs replace command rather than adding a new device and removing the failed one. This is a newer technique that worked for me when adding and deleting devices didn't however it may be helpful to consult the mailing list of irc channel before attempting recovery.
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Forrás: https://btrfs.wiki.kernel.org/index.php/Using_Btrfs_with_Multiple_Devic…