@hoegaarden_bier Yes, you have to back up 9GB. you may compress and save it(we may need to use this backup on the worst case, in case if we face issue with the recent version on upgrade).
Command to compress:
tar cvf mycontroller.tar.gz mycontroller.mv.db (may reduce some amount of size).
You may copy the database to your computer. If you are running in Raspberry PI, just take the memory card and copy it in your computer.