how to do that properly? I have a big initial backup file so I chose to spilt that in to 2 4.7G files during the proessing. Than i got 2 files xx1 and xx2. later i want to do differential backup, I chose to make that on the base of xx1, acronis produce one new file called xx3, then i make another one on the base of xx2, and another file called xx4 was produced and which is different from xx3. I feel that is not realy proper. so i want some advise about how to do a proper differential (or incremental) backup on the basis of splitted initial backup files. Thanks!