I am new to DS-708. I too wanted to update to 6.13 without risking my original software. I downloaded a program called 'DIXML'. That program allows you to create a full image of the original drive(SD Card). I then wrote the image to a similar new SD card. My original card is 4GB Sandisk Class 4, so I bought a like kind card. It worked perfectly, my original card is stored safely away, and a disaster recovery image is always available if really bad things happen.