The pattern seems like backup will be successful the first time. The
second time will fail and remote server will lock up. No keyboard
response, have to do a hard reboot. The remote server generates
TSA$TEMP.001 and TSA$TEMP.002 in SYS:\SYSTEM\TSA folder. The time stamps
on the temp files are the same time when server is being backed up. More
temp files are generated as backup continues to fail. When the temp files
are removed, the backup will be successful again the first time and the
pattern repeats. Server is NW6.5SP3, holds the master replica, is a DNS
server, an FTP server and also running Zenworks for Desktop v4. Any
advice on what's going on is very much appreciated.

PS. The backup server backs up its own volumes successfully.