原来NBU MASTER安装在C盘了，导致C盘空间剩余很少，在官网找了一个解决方案如下：
- before any operation, of course backup your catalog and you C: drive
- stop netbackup
- Create if not exist the directory “D:Netbackup”.
- Copy C:VeritasNetbackupdb to D:Netbackupdb
- Rename C:VeritasNetbackupdb to C:VeritasNetbackupdb.old
- Run regedit.exe and create in “HKEY_LOCAL_MACHINESOFTWAREVeritasNetbackupCurrentversionPaths” a REG_SZ key “DATABASE_PATH” with the value “E:\Netbackup\db” {double the ““ sign in the value}
-restart netbackup