Snapshots and Remote Destinations

We have Snapshot installed on a number of sites and everything configured how it should be. Backups run if you do them manually, but are not going to remote destinations.

There are no logs or errors, the time simply comes and goes for when it should be transferred. I can confirm that the remote destinations are working, per the plugin. Using SFTP and all needed server side modules are available.

Any help would be appreciated.