Hi
We have the same problem with the backup job not cleaning up correctly. In our setup this also have an impact on the time it takes for the backup job to finish.
By deleting the "obsolete" snapinfo folders under ..\SMSQL_SnapInfo\VDISK__MountPoint-001\FG__ we can sometimes cut hours of the backuptime.
We have tried with different versions of SnapManager for SQL and SnapManager for Exchange, with no diffenrence. We even filled a case with NetApp through our supportpartner, which didn't solve the issue.
In some cases we use a post script that deletes obsolete folders when the backup job is done.
Regards
Kim