I have used NTI BUN 4.0 for unattended backups for several years. I have a dell inspiron 8600, win xp, cd drive QSI CDRW/DVD SBW-242. When 22.214.171.124 came out, I attempted to upgrade was was never able to get the unattended backup to work so I stuck with 4.0. I have a new laptop on order with Vista OS so I have been trying to get my software in order compatibility-wise. I downloaded a trial version of NTI BUN 5.0. (In terms of conflicting software, I did a format of the hard drive and clean reinstall just prior. So, in my testin, 5.0 does an unattended backup (I selected no compression, overwrite) to the cd drive. However I am not able to restore that backup. When I reach the point "what to restore?", I select the file on the CD. (I was surprised I had to browse to select the file. I thought it would just auto enter in the space). Anyway, When I select the file and hit "open", I get "The format of the file had an error or was invalid". Don't know where to go from here.