CTM worked all right until I installed Comodo Disk Encryption. The Finish re-boot to complete installation of CDE returned my Snapshot to several hours prior to its (actual) current state, obliterating one text file and one sent e-mail from a few hours earlier. Fortunately, I was able to recover the text file from a backup disk. The e-mail was unimportant.
There’s apparently a conflict between these two Comodo programs (at least on my system’s configuration).
Other than, Comodo software is splendid, a real boon, and I hate to complain about anything they offer.
you cannot only do actions about the free space
you can do every else, like securely delete files (but this will raise snapshot size)
and any file/registry deletes
remember, CTM saves the snapshot in the free space, so do not mess with the free space with any program
Not to use the erasing for free space?
It’s a requirement of the technology itself. You won’t be erasing the file but just redirecting the erasing to the free space of the disk (“moving” the file) and increasing the snapshot size.