Differenced/Partial support?

Oct 8, 2010 at 5:13 PM

Are there any known issues with Differenced/Partial file backup support?

I'm using AlphaVSS to try a differential backup.  I take a full backup for the Sql Server Writer.  I think make some changes to one of the databases and attempt a differential.  In the diff, I set the previous backup timestamp for each component using the timestamp in the full backup's components document.  I then prepare for backup (state of Diff), perform the snapshot, and look at the Component related to the database I changed.  DifferencedFiles is empty.  If I enable Partial support, the PartialFiles collection is empty.

Is there some mechanism I'm missing to detect which files are changed?