I use CDs for backup... yes, sometimes CDs will fail and there's no way to check... sometimes DAZ EXE and ZIP files get corrupted in the process. The way around this is... burn at a slower speed (If you have a 48X, burn at 24X). It's all good to have a burner with over and under burn protection. I don't appreciate CDRs because if the top surface gets scratched off, there goes the data too. So a paper stick on label comes in handy to buffer in between. Harddrives are good, but they can fail at anytime. Once I bought a PC with a new IBM 45GB harddrive - Brand new! It lasted only 30 days!!!!!! I posted a new article on my home page "Poser Reloaded" regarding DAZ and ZIP files. It takes about seven clicks to install a Daz file... so painstakingly, I converted my entire EXE files to ZIPPED runtime folders. Whenever I'm ready to install my files, I run Equilibrium and it requests the CDs and install them on the fly. It also will record the location of bad or skipped zips or EXE files that were not installed. It doesn't and won't install a duplicate file -even if the name is different. I did like the EXE format... but it's way too many clicks and it time consuming when you have a lot to istall. My suggestion is... convert to zips! Furthermore, you don't have the file check when using upgrade files like v3 upgrade nor will you have to waste time trying to find the base files.