I wanted to try to convert my music library from a directory into a subvolume so I could use btrfs send/receive to transfer (changed) files between it and a USB backup. A bit of Googling suggested that the approach would be: > btrfs subvolume create /library/newmusic > cp -ar --reflink=auto /library/music/* /library/newmusic/. > rm -r /library/music After about 30 seconds I realised that it was deleting files from both /library/music and /library/newmusic. It appears I've only lost everything starting with A, B or C, so I unmounted the device, and am currently trying to use `btrfs restore` to get the files back and it doesn't seem to be finding them. I'm pretty sure deleting files from directory A isn't supposed to also delete them from directory B, but that's what it did. Is this a bug? Robbie
