Returnil (System Safe 2011 Version 3.2.12918.5857-REL14) warned its space was running out. This was not unexpected. However, curious as to what was causing it, precisely, I checked with SpaceMonger and found nothing extraordinary except two files called Rvssystem.Cch dated several months back. I know these files are related to Returnil, and probably are the cache files it uses to shadow the disk. What I don't understand is why there are two of them - one in ProgramData, one in Users - or why they are dated several months back. My guess is ProgramData may be some kind of junction or symbolic link, and its actually the same file. If not, can one of them be deleted? What's with the old dates, though?