Now as the RetroDECK CM another benefit is it also make it rather easy to move the important data between installations.

If you take RetroDECK for example all you need to do:

1. Move/Copy the RetroDECK datafolder that is either in home or sd-card/other drive to the new device.
2. Re-install RetroDECK from flathub on the New Device.
3. During initial setup point to the location where you put the RetroDECK folder.

That is it.

All your roms, saves, scraped data and everything has been moved.