Hi, I've been using Paragon Backup & Recovery 10.1 Free Edition on Win7 x64 PRO for few days now and I don't get the differential backup idea. I've made the base archive of my internal disk. With the normal compression it's about 65 gigs. When I try to do the differential backup and choose the appropriate base archive for it - it takes exactly the same size of 65 gigs and have to wait another hour to complete the process. I suppose it's not like this by design isn't it? Even If I try it right after the base archive making process. My internal drive is nicely defragged and backups are stored on an external USB drive. In the settings skipping auxiliary OS and archive files is left checked by default.