By saying "manually", I mean copying files into a subvolume on a different mountpoint manually, then mark the target as if it is created by "btrfs send | btrfs receive". Rationale: When we delete all common snapshots from source, we have to send whole snapshot for next time. This ability will prevent sending everything from scratch unless it's necessary. (https://unix.stackexchange.com/q/462451/65781) Possible workaround: I've got an idea at the moment: What I want can be achieved by dropping usage of "btrfs send | btrfs receive" completely and using only rsync for transfers. After transfer, a snapshot can be created independently on the remote site. Only problem will be handling the renamed/relocated files, but `rsync --fuzzy` option might help here: https://serverfault.com/a/489293/261445 Anyway, it would be good to have a built in support for this.
