Backing up hard drive (missing a few files in backup)

[Pate]

I'm backing up my hard drive (all meagre 1.2tb onto my external 1.5tb drive).

However its not matching up,

I'm

1 folder, 13 files and 1gb from having a match.


Is there anyway to find these files without having to recopy over 140k files?


Windows 7 here btw.