Thanks, thats the method I am currently using. When I thought about my original goal, your solution works just fine.
In Vista I use the Windows Backup application for weekly backups. I have a backup set from 9 months ago at 4 GB’s. So what I am doing now is extracting all the zips, deleeting the files I know I dont need and I’ll re-pack them in a 7z.
Burn to DVD and toss it in the closet :D
My original plan was to combine the zips, then delete un-needed files. Then convert it to 7z. But your suggestion is faster and easier.