Snapshot policy not working

I’m trying to back up my user folder, including the AppData folder (has a bunch of video game saves and configs). After the initial backup, I ran into warnings about locked files, so I made sure snapshot policy was “on,” Duplicati is running as a service, and VC++ is installed. After setting it up and rebooting, I still get 400-500 warnings every time the backup runs.

I am not willing to pick and choose files or folders to back up or exclude. There are too many either way. I just want snapshot policy to work properly.

Edit: Adding that with snapshot policy “on,” “SnapshotFailed” appears as the first warning in the log. “Failed to create a snapshot. Attempted to perform an unauthorized operation.”

This can be closed. The service was not installed properly.