I recently used WINMFS to upgrade to a larger HD in my Series 2 DT Tivo. The .tbk file I downloaded was captured from a virgin box (80 GB drive) and was less than 200MB in size. Curiously, the only .tbk files I have created came from a Series 1 Philips with a 14 GB drive but the file size was over 6 GB. My question: why was my Series 1 file so large compared to the Series 2 file? As far as I know, both were captured using the latest version of WINMFS.