Don't know if this setup will work for you but there was a good discussion about how someone else backs up lun the other day on the mailing list. The thread can be found here:

http://www.nabble.com/Mounting-read-only-snapshots-using-open-iscsi--td20460937.html

Romeo

On Wed, Nov 19, 2008 at 9:30 AM, Paul Letta <letta@jlab.org> wrote:
Hi all,
 We are pretty new to using iSCSI here.  I have  another question about backing up the LUNs.  My backup software uses NDMP (with direct attached drives on the filer) and that's how I do the other volumes on this filer.
But the LUNs are just one big file.  If I want to do weekly full and daily incremental, how does that work ?  NDMP/dump is file level, so each night an incremental will really be a full.
Is a client side  backup program my only solution to get file based backups from a LUN ?  The Lun will hold an NTFS file system.

Thanks.

Paul

specifics:

Windows machine, using iSCSI initiator mounts LUN on filer as D drive.  I need to do file level backup/restore of this D drive.









--
Romeo Theriault