Scripts have been run on windows system supplied by Quest solution SOL79286 that set up exceptions on windows 2008 firewall but backups only complete if they do not have a pre or post script.
Open command line and cut/paste in the one of the following command lines below after checking the netvault home directory. The two commands below are for the old and new default netvault installation directories.
NOTE if you do not use a default directory location as shown below you will need to modify this command to suite your custom home directory.
netsh advfirewall firewall add rule name="NetVault Scripts" dir=in action=allow program="C:\Program Files (x86)\BakBone Software\NetVault Backup\bin\nvsysexec.exe"
netsh advfirewall firewall add rule name="NetVault Scripts" dir=in action=allow program="C:\Program Files (x86)\Quest Software\NetVault Backup\bin\nvsysexec.exe"