SBS2003 backup to external USB hard disk stops at 4+GB - Why?

I used the SBS2003 wizard to backup to USB drive.  When I run backup, it always stops after 4+ GB.

I've been backingup to tape for over a year with no such problem.

Did I miss something in the wizard?  Why does it stop after 4GB?  USB has 255 GB free.  Is it because I'm placing the file in a folder on the USB drive (E:\sbs2003\)?
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How big are the files you attempting to back up?
SydDAuthor Commented:
Just the normal SBS2003 stuff.  Users=25.

I posted this twice by mistake.  I think I have an answer from Leew in the first post (change type from IDE to NTFS).   I am going to try to back out of this one (the second post).  Thank you for helping.  Excuse my blunder.

You are trying to backup to a fat32 drive. The backup software will usually try to make one file for all your backed up data, and fat32 only supports up to 4GB files. You'll either have to tell the backup software to split the files into chunks that aren't larger than 4GB, or use ntfs as the filesystem you are backing up to.

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