I use 3 programs to back up my Windows drive: Macrium, O&O DiskImage Professional and Ashampoo Backup Pro. Each one is used on a different night(s).
I just noticed that the backups dropped in size about 3 weeks ago from some 100GB to roughly 60GB. (The size varies by a few GBs from backup program to program.)
Since the backups are compressed, I can’t just browse them to try to determine the differences.
I’ve also noticed another strange phenomenon. Ever since the space left on the drive I back up to hit the 400GBs, it remains in the 400GBs after each backup. Sometimes, it’s a little less than what it was before the backup and sometimes more.
The disk monitoring program that I use – HD Sentinel – reports that the drive I back up to is 100% healthy.
I’m stymied as to how to proceed.