Cannot find most recent backup

I ran what I thought was a full backup on my PC last night.  When plugging in my portable hard drive today, the latest files I can find are from 2011.  How do I know this is updating properly and where should I be looking for my most recent backup?

If you are using smartware, when you go to the backup tab it two columns should show the same blue blocks, if not then your backup is not complete.