Access to deleted user's Time Machine backup
I use my Mac Mini as a backup server for multiple users. I inadvertently deleted one of the users and would like to access their last known backup to retrieve some of the files.
I cannot mount the backup, modify its owner, or really do anything but confirm the last time it was accessed and file size. Sudo or otherwise.
How do I access these backups?
Mac mini, OS X Yosemite (10.10.3)