I do use a backup drive. Its just that years ago I backed up all my purchases on DVDs. I was at DAZ when it was still Zygote! Years ago DAZ decided to change their format from Mac SIT/installer to plain zips. I had thousands of things to download but there were too many so I downloaded them as I came across them. My new system won't run the VISE installers anymore. I set up an old computer yesterday so now I can expand them, install to a dummy runtime, then zip.