There are a number of ways that you can solve this problem.
*** Make sure you read the man pages and/or google for it so that you know what you're doing with it. They can ruin your day if used incorrectly.
1) boot up to Suse and try one of the disk partitioning commands
( Redhat has parted and cdisk among others )
The goal here is to ensure that Suse "sees" the disk.
2) You can copy using the "dd" command if the disks are identical. This has the advantage that you can actually replace the original disk with the backup if there is a drive failure.
You can also play with the rsync command, but you would have to mount the disk first. rsync also allows you to backup files to a remote linux computer.
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Have you tried the linux version of ghost? I haven't used it myself.
If you have a CDRW you might also look into Mondo.
list of backup software
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http://linux.tucows.com/backup.html
using dd and rsync
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http://xpt.sourceforge.net/techdocs/linuxdisk/ Tools/linuxdisk09.000.html
Hope all of this helps some!
Thom