I certainly would not, not recommend using the Rapid Delta Restore. I use it all the time. If I want to test a new program or try out a windows update, first I take a Macrium Incremental. Time usually 45 seconds. If I find I immediately don't like what I am seeing, I just do a restore and it's gone. Now on this system full restores take right at 20 minutes. But this Macrium RDR restore usually takes about 45 seconds. In fact it helps me evaluate new imaging program restores. How you ask. Well the Macrium RDR restore only replaces sectors that have changed so what I do is image with new program, and then image with Macrium. Then I'll test restore with the new program and if the boot is normal I will go right into the boot menu option and do the Macrium restore which should be an RDR restore. It should be real fast 30-45 seconds. If it takes much longer it tells me that there were more sectors that needed to be replaced and that makes me wonder about the other program restores.