How much data is on each of the systems. With compression you should be able to halve the total file size. i.e. if you have 3G on a partition you should end up with a 1.5G to 2G backup file. You will need to allow for each partition plus a bit (say 1G) to spare.
Remember that under a FAT32 partition there is a file size limit of (I beleive) 4G max. It is much larger under NTFS, but that might introduce other problems.
Do you intend to use something like Norton Ghost or Drive Image for the backup?
Thanks for your advice. I have been using Aid System Restorer to back up my main Windows 98 files and the main files of the programs I use. I don't know which files it backs up so can't use the size of the back up to estimate how much space will be taken up by any XP back up.
If this info helps you to give me any more advice I would be grateful for it.
Go to Windows Explorer right click on your HDD click on Properties and it will tell you how much is used and how much free space make your partition larger than used, you will have to judge what amount.
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