Hi, I've been unable to run Managed Backups or create new Snapshots on any of the sites on which I have WPMU Dev plugins installed. The problem persisted until I uninstalled Hummingbird (and made sure all its edits to my .htaccess files were gone). After that, I had no trouble making backups. I'm going to need to uninstall Hummingbird from all the sites I maintain and back up because of this. Please let the devs know, Hummingbird is a great plugin but right now it's literally unusable.
For additional information, things I tried (and didn't work):
- deactivating all other plugins
- changing to the default theme
- increasing max execution time (and other similar edits to PHPrc)
The way I found out about this was I had one site where I had Hummingbird deactivated, and that was the only one that my backups went through on.