My anti virus program always sets a checkpoint when I download something. At first I hated it but then I picked up one of those annoying pop ups and I just went to my checkpoint and set it back a day and everything was back to normal. Same thing wiped out my dd computer. I also back up my files to an external harddrive.. The most I could lose is a day or two. I have seen too many people crying over lost pictures and stuff. It also keeps my computer running faster and less to defrag and such. Hope this helps.