Though I would pass on what I’ve learned about backups on the BuzzTV 5, and the 4500’s with Android 9 (I had both a 4500 and 4500 MAX).
The backup in settings / configuration in BuzzTV 5 backs up your servers, setting and favourites in a zip format which can be transferred to another box.
On the 4500’s under Buzz utilities there is a full system (box) backup and restore feature, and it is unique to the box itself and can’t be used to restore another box.
It can only back up to SD or thumb drive (not internal storage), and if your backup file showed 0 bytes then it’s likely 4 gig or larger, so you need to format as X-fat or NTSF. If you put the card in a PC and run check and repair errors the true file size will populate, but it will still be unusable for restore. Hope that helps. It would be great if Buzz would bring this feature back one day.