Marvin 3.0 and Backups

Is it possible to backup Marvin 3.0 to cloud storage (such as Dropbox), and then restore Marvin from that backup file?

I have tried restoring Marvin 3.0 from a backup file I saved to Dropbox by downloading the backup file within the Dropbox app, then exporting it to Marvin 3.0. So far I have been unable to get this to work. I must be missing something if this is still possible.

If it is possible, could someone provide instructions on how to do that?

Thanks!