?ing size of back up

Here's my story and any help w/b appreciated.

Just had to do a complete restore for the 1st time using my Acronis TI 2013. It seemed difficult to get it going but finally got it going and it restored what I thought was everything but now when I do a new backup its total size is only 63.03gb while the C drive I'm backing up show as used 106gb. All my previous backups before the above 1st ever restore were about 106gb. When I noticed this discrepancy I immediately checked all settings to make sure I was doing a full bu of my C drive and did another full backup and again it came to only 63.12gb.

Has anyone got any idea why it is not doing a full backup any more???