We recommend zipping all the data in the /home/pioreactor/.pioreactor folder. This will include your sqlite3 dbs (which include experiments), calibrations, configs, plugins, etc.
We have some (out of date) instructions here: Export and import your data | Pioreactor Docs
I just tried it, and there is an bug in the pio run backup_database --force line. You can comment that out, but perhaps before you start, run pio run backup_database --force yourself.