We use a combination of scheduled backups, interspersed with continuous backups, to ensure files are completely protected. It is possible that the first job did not grab all of the files (if they were locked/open, if there were network issues, etc.) , and so they were picked up by the second job. (Or if files had been modified between time 1 and time 2, we would back up the modifications, hence the additional notification.)
If the data in the folder is relatively static (i.e. not changing) since the first backup, and you continue to get messages about additional data being backed up, please let us know by contacting support (either by phone or by using the ticket submission functionality inside the portal).
An easy way to verify that files have been backed up is to visit the Restore page for your computer and verify the files that are shown as available for restore. Also, support can work with you to look at any log files you may have for more details. We are working on some enhanced functionality for the future that will give you more "real time" visibility into the files that have been backed up as well.
Thanks for being an SPN customer! Richard Goodwin SPN Product Management