Stéphane:
Thank you for your thoughtful responses! So if I understand you correctly, say I do a clean install of Ubuntu 19.04 on my new SSD. If I copy the /var/snap/lxd/common/ folder over to the new SSD (/var/snap/lxd/common/) when I spin up LXD I should have the containers from my prior install (old SSD)?
Thank you!