ok you where able to mount the SD card as well as USB stick? good if rsync complete.
To be able to restore the backup during Initial setup:
- flash SD card with a new image
- adjust /boot/dietpi.txt before first boot and adjust following.
# Restore a DietPi-Backup on first boot: 0 => disable | 1 => interactive restore (show list of found backups) | 2 => non-interactive restore (restore first found backup)
# - Simply attach the drive/disk/stick with contains the backup. All attached drives will be mounted temporarily and searched automatically.
AUTO_SETUP_BACKUP_RESTORE=0
- You could set it to 1
- connect SD card + USB stick to the SBC
- boot your SBC
- usually the initial setup should detect your backup now