Just an SD card inside so if you are capable of opening the unit you could back it up that way.
I know, I did this once just so I have a backup in case the SD card gets trashed.
If the SD card is not trashed you dont need to open the unit again. To read and write a 64GB SD card takes quite a long time,
The backup/restore system on this system is working very well, and its very quick and easy to do backups and restore.
I keep a fresh backup of the SystemV46 partition, in case I install something that could potensially mess up the system.