I have some directories under C:\mnt which do not change - they have a fixed created/modified date.

I then mount some volumes to these directories, turning them into NTFS junctions:

C:\>dir c:\mnt

 Volume in drive C has no label.
 Volume Serial Number is 29CD-179E

 Directory of c:\mnt

27/11/2009  03:50 AM    <DIR>          .
27/11/2009  03:50 AM    <DIR>          ..
27/11/2009  03:28 AM    <JUNCTION>     SCO-FILE1-F [\??\Volume{85de6ca8-daa7-11de-93aa-0019bbc8e994}\]
27/11/2009  03:50 AM    <JUNCTION>     SCO-FILE1-G [\??\Volume{85de6ca9-daa7-11de-93aa-0019bbc8e994}\]
26/11/2009  07:02 PM    <JUNCTION>     SCO-SQL1-E [\??\Volume{85de6ca1-daa7-11de-93aa-0019bbc8e994}\]
               0 File(s)              0 bytes
               5 Dir(s)  20,186,116,096 bytes free

The problem is that both the Full Backup and the Incremental Backup wind up backing up all the files!
What I wanted was for the incrementals to just contain the changed data.

I am attempting to use Synthetic Backups for this, so I wonder whether the extra attributes it gathers might be affecting the outcome? See:
http://www.symantec.com/connect/forums/aofo-error-be-server-aofo-not-selected-iscsi-snapshots-mounted

Any idea how I might be able to solve this?

Thanks,
Simon.