I created an archive of my primary twice this afternoon. I wanted to have a backup on 2 separate drives. As I ran into some errors along the way (related to VSS not being available), I looked at the logs carefully. While I finally managed to get two archives created, I don't quite understand the size information provided. Both are from my primary snapshot and while I did make an upgrade to one program, I don't think the size should vary a lot. These are the details: archive A: from log copied 48.73 GB - 163399 files, 31464 directories - 1h 31 min archive B: from log copied 58.41 GB - 186691 files, 34444 directories - 1 h 42 min looking at my explorer the size of archive A is 83 GB and for Archive B 61 GB and I checked twice against the time stamps to ensure I am not mixing these up The size of my OS drive is (used) about 107 GB - which I thought would be roughly 70 gb for my prime snapshot plus 35 gb for my stripped down secondary - the Gui gives these sizes as 56 gb for primary and 59 gb for secondary Can someone explain these varying sizes?