On Thu, 10 Jan 2008 08:07:52 -0500, John H.
wrote:

I have a 160 GB external hard disk to which I tried to back up my documents
and settings using the Windows backup system.

After about a half hour, I get a message saying there's not enough room for
the backup, and that if the hard disk is FAT 32, the backup can be no
larger than 4 GB. So I checked, and sure enough, the external HD is FAT 32.

Now what? I already have about 50 GB of stuff on the external HD that I
don't want to lose by reformatting (if that's what's required).

Don't fool around. Just buy a bigger HD, and format it in NTFS.
Then reformat the other one, and use it too.
Better to have at least 2 backup drives for Murphy Law insurance.

--Vic