Import/Export VMs from Multipass

We currently have no "easy" way to export and import Multipass instances. But it's just data, so it should be possible to manually do it:)

If you'd like everything back to the way it was, I would just save the whole of /var/snap/multipass/common/data/multipassd/ and after doing the clean 19.10 install and installing the Multipass snap, just copy that back to the same location and do a snap restart multipass for the daemon to pick up the changes.

If you want to pick and choose, that'll be a bit more difficult as you'd need to selectively pick the instances in /var/snap/multipass/common/data/multipassd/vault/instances and then modify both /var/snap/multipass/common/data/multipassd/vault/multipassd-instance-image-records.json and /var/snap/multipass/common/data/multipassd/multipassd-vm-instances.json accordingly.

I hope this helps and good luck!