I'm either overlooking something and I'm a dimwit or the guy who set this up is a dimwit. Software used was Cobian backup to make 7z archives. I've attached screenshots but it doesn't make any sense to me. I can open all of the smaller files, which I think are differentials. The problem is the file I need is in the one dated 12-01. As you can see, the files are limited to 2GB and were split when they exceeded that size. I can not open any of the large 2GB archives. What is strange to me is that from the get go there is a file with 001 extension, does that mean the first full backup is missing? Yet it is named "backup" while every subsequent file is name "primary." I'm lost. I've tried using the decompressor option in Cobian and it just locks up on any of the larger files. Wanna kill these ads? We can help!