Why do I have to select all drives in image backup

I'm testing image backup and trying to create server backup of only one of the drives.
I have 2 drives, second one stores old backups and I don't want to back it up. When I select only drive c (system, mail partition) it gives me warning: It is highly recommended to include boot partition (System Reserved) in the backup to make the backed up image bootable on restore. I can't proceed with only c drive selected. There is no system reserved partition on any of the drives, drive C is a boot drive. Aditionally I can't backup only second drive. it's very frustrating.

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