documentation for migrating existing volumes (on btrfs) to buttervolume

[dev-zero]

is there a better way than rsync, cp or mv after creating a new volume?

[ccomb]

Hi! It all depends if your /var/lib/docker/volumes is on the same BTRFS partition than /var/lib/buttervolume. It this is the case, you can probably mv your volume to /var/lib/buttervolume/volumes/, or create a snapshot of your volume into /var/lib/buttervolume/volumes/<vol>. Otherwise you need to cp -ar.
Could you please tell if you succeed migrating your volumes? It could be a good idea to add a section for that in the doc