DPM does not protect reparse points found in file systems, except for deduplication reparse points, which are protected. ...

DPM does not protect reparse points found in file systems, except for deduplication reparse points, which are protected. If you have selected volumes or folders in this protection group, all data is protected except for the unprotected reparse points.
Read "Select Group Members" page of DPM 2012 Help for more details on unsupported data.