Grandpaw, Is This The XP Machine?
If XP is the operating system, then you should be able to RIGHT click on the "Backup" folder, choose "Properties", then UNCHECK the "read only" box, then click on "Apply". A small window will load asking if you want to make the changes on the "folder only" or on the "folder and all subfolders and files". Choose the second option and all files inside will have their attributes changed.
Hope this helps.