I am running a 500GB hard drive in my desktop PC and am using Windows backup to an external 1Tb usb powered HDD.
The backup is scheduled for weekly backup. A check on the 500 GB desktop HDD shows I have 179GB of free space but the 1Tb external HDD shows I have only 7.9MB of free space!! The external HDD is used exclusively for Windows backup. I also backup my important music/photo etc files to a separate external HDD as a double precaution.
Mathematically - 2x (500-179) = 642, so I should have 300+ Gb left on the 1Tb drive, even if the whole of my main HDD had been duplicated.
Am I doing something wrong as I thought Windows backup did an initial system image then updated only changed/added files?
I apologise if this is a silly question but don't understand why my external HDD is filling up. Surely it will not be able to do a backup when next scheduled.
Is Windows backup a waste of time?