Back-up With New Version

I have been using TI Home 2012 for a while. I'm bad - I do a full back-up but only about once a month. When I went to initiate a new, full, back up today, it said new version available so I let it download and install. I'm now on build 6154. The back-up seemed to go normally, about the same time but the total files are much smaller. The 2 previous back-ups were 99.1 and 99.2 GB but todays is only 58 GB. Noticed when I started that I had to change default incremental to full. As I recall I used to just accept normal compression and didn't see anywhere today to pick.

Like I say, it seemed to complete normally but I'm a little concerned. Any thoughts?

Thanks

Jim Kolsrud