How to restore previous iPhone backups (not the latest one)

I messed up with my contacts a bit on iPhone 5 and then did not the smartest thing — connected it to the computer and it backed up, erasing all previous contacts from the computer too.

However, in \AppData\Roaming\Apple Computer\MobileSync\Backup folder (Win7) there are some previous backups for my iPhone (from November, October, etc.), which hopefully contain the contacts.

iTunes does not see the earlier backups, only the latest one. Although all the files are together in the iPhone backup subfolder with long gibberish name. Neither other recovery soft can see the previous backups.

My guess is that Info.plist, Status.plist and similar files are responsible for that.

How can I backup from previous backup files and not from the latest? Do Info.plist, Status.plist, etc. have to be changed / deleted?

Many thanks in advance.