Restoring is a bit tricky.
RE: How to restore from an omv-backup?
gunzip -c /path/to/backup.dd.gz | dd of=/dev/yoursdcardOSpartition bs=1M status=progress
you need to do this on another linux computer; if you have only Windows, you can boot a live distro like Linux Mint
Wouldn't it be easier to do a fresh install?
