The first thing to do is find out how many files/folders are involved and how drive space is used by them. A data dvd holds just over 4gb. If you have only have 4-5gb of free drive space you risk the chance of seeing error messages coming up about the lack of free space needed for virtual memory where the system creates a paging file. Those are generally about 2gb in size. One or more data dvds would then be one idea.
With multiple drives seeing multiple OSs backing up files for one drive goes to another with enough free space. With XP Home on the primary ide drive and Vista on the second I don't have to worry about filling the first sata drive with backups even with XP Pro installed there for temporary use. The ide drives are 238.4gb after partitioning and formatting while the now two sata drives are 465.88gb there. (ut oh! time for some rearranging here!
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