Why does my bare metal backup only restore the system volume?
Bare metal backups and file-level restores.
When restoring from a bare metal backup, only the system volume (typically C:\) is restored.
Windows bare metal backups only back up the system volume. Partition info is backed up as well, so when restoring from a bare metal backup, only the system volume’s data will be restored but the entire logical geometry of the client will be restored.
After restoring a bare metal backup, volumes other than the system volume are present but no data is restored. Use standard file-level restore procedures to restore this data.