No thanks to any Acronis documentation, I've figured out the way backup locations work. Only took a few thousand dollars of my time. But I have to ask what the heck something is doing on what I think is a successful backup location job. I have a backup location set on a usb2 attached external drive. Unlimited storage size, with a total of 6 backup files allowed. Then, I have a task which does differentials to that backup location, specifying to make a full backup after five differentials. What I thought this would do is start out with a full image, then do five differentials, and then the next time, remove all the files and do a full image, leaving just one image in the backup location. Instead, after the 6th backup (one full and five differentials), it took forever (being stuck at 82% done with 2 minutes remaining for over an hour), and what I'm left with is six backup files in my backup location consisting of one full and five "slices" The five slices have older date/times on them than does the full image. And now the best (worst) part. On the next backup, instead of creating a differential since it had just created a full the last time, it created another full!!! So I now have five old "slices" (differentials), then a full image and now another full image. What the heck is this? I guess I need to go back to the old method of a full on every Sunday and differentials the next six days, and forget about these unexplained, ill-designed backup locations. Or can someone tell me how to get the same effect with backup locations? This plus my other thread I've got started on tasks no being allowed to access network computers and I'm scared to death about having to do a restore any more.