[Overdriven]

Assuming you are concerned about more than just taxes and such for retaining reciepts. Because store reciepts are printed on photo sensitive paper that fades rather wuickly, I usually make a copy of them for big ticket items or warranty purposes. I've had a few instances where I had to use the copy and the store accepted the copy no problem. For anyone thinking about this, crumple the reciept up a little and then copy it. The crumples show up on the copy and help prove its not doctored as the crumples would make it more difficult. Most stores don't care as long the copy scans though.