Thanks, @alex.

I found the Pleroma instructions for database backup and system upgrade. It looks like I can handle it. My idea is to make a new Digital Ocean droplet, with Ubuntu 20.04 (I always stay at least two years behind the most recent Ubuntu Long Term Release, but if you know a reason to use 22.04 instead, I'll do that).

Next I'll install the next version of Pleroma (2.0), from scratch, then copy the database from my live server, migrate it, and test that it works. If it does, I'll turn off the Pleroma server on impeccable.social, copy the database over one more time, migrate it, and test the update.

After that, I'll go through the Pleroma upgrade process until I get to the latest version.

Finally, I add Rebased as a git remote, pull it, and run migrations once again. Then I can point DNS for impeccable.social at the new server, use it for a week to make sure all is well, and delete the old droplet.

I may start this as early as tomorrow. Will let you know how it goes.

Pleroma backup: https://docs.pleroma.social/backend/administration/backup/
Pleroma update: https://docs.pleroma.social/backend/administration/updating/