Ownership Enabled Question

Simple: I have two externals (WDs) I want to consodate....I erased one to have room for the backup file on the other....when I went to copy the backup file onto the newly erased external...I go the message "The backup can't b copied because the backup volume doesn't have ownership enabled." What do I do to enable the file? I simply want to copy the file...any help is greatly appreciated...the file I'm trying to copy has this under the blue file: Backups.backupdb...if this means anything...thanks again...