Snapshot

I have snapshot pro installed in Multisite environment.
It is working correctly for one of the sites: sos.myagentgenie.com
But will not create backups for dev.myagencygenie.com or outsideagents.com
I am trying to send the backups to a dropbox account, just different folders.
it is sending to dropbox for one of the snapshots, but not the other 2.
Any ideas why this would be?