Backup not working

fourthturn wrote:
The NAS appears to be holding on to old IP addresses rather than recognizing PC's strictly by host name.

did you see it show the old IP in some logs? the more likely thing is it couldn't resolve the hostname at all. if the systems were off then just recently turned back on, the master browser elections probably weren't complete, so no one PC/Server in the LAN took control for answering what local host was which machine. WINS would resolve this issue.

The browser service maintains a list of the domain name or workgroup name the computer is in, and the protocol being used for each computer on the network segment being served by the computer running the browser service. On each network segment, a master browser is elected from the group of computers located on the segment that are running the browser service. The master browser is responsible for collecting host or server announcements, which are sent as datagrams every 12 minutes by each server on the network segment of the master browser.