A DFS Junction? ( from 7.4 user guide. - Hope this helps)

A DFS junction is a DFS root (namespace for files and DFS links) or a DFS link
(connection to a shared file or folder). DFS junctions are file system objects, but are
not files or directories. Therefore, the NetWorker software does not treat DFS
junctions the same as files or directories for backup and recovery. However, for
simplicity, DFS junctions appear just like files and directories in the NetWorker User
program.

To configure a scheduled backup for a DFS:
1. From the Administration window, include the following clients in the
NetWorker group that will be back up the DFS:
¿ The DFS host server
¿ Any computer where remote DFS destination directories reside
¿ A domain controller (domain-based DFS only)
For example, you could create a NetWorker group named DFS, then make each of
the preceding clients a member of the DFS group.
2. Enter these save sets in the Save Set attribute for the DFS host server¿s Client
resource:
¿ The DFS root. For example:
C:\MyDfsRoot
¿ DFS destination directories that reside on the DFS host. For example:
D:\MyLocalDir