I think I can use iSCSI in places where software doesn't want to do backups over networks.
The protocol allows clients (called initiators) to send SCSI commands (CDBs) to SCSI storage devices (targets) on remote servers. It is a popular storage area network (SAN) protocol, allowing organizations to consolidate storage into data center storage arrays while providing hosts (such as database and web servers) with the illusion of locally-attached disks.
http://en.wikipedia.org/wiki/ISCSI
"The Microsoft iSCSI Software Initiator enables connection of a Windows host to an external iSCSI storage array using Ethernet NICs. This download can be installed on Windows Server 2003, Windows XP, and Windows 2000. For Vista and Windows Server 2008, the iSCSI initiator is included inbox. The Microsoft iSCSI software initiator makes it possible for businesses to take advantage of existing network infrastructure to enable block-based Storage Area Networks without having to invest in additional hardware."
http://www.microsoft.com/downloads/details.aspx?familyid=12cb3c1a-15d6-4585-b385-befd1319f825&displaylang=en
But, iSCSI is not a toy... rebooting the iSCSI server (target) is like yanking a live drive. Don't do it.
http://www.microsoft.com/communities/newsgroups/en-us/default.aspx?dg=microsoft.public.storage&tid=fc6ff2f0-6df2-4a1a-8723-ca41e424db4c&cat=en_US_74589424-a0f2-411f-b5d6-43209e17b7e1&lang=en&cr=US&sloc=&p=1