Error when running backUP

Error message: “Found 3 files that are missing from the remote storage, please run repair”

Repair doesn’t do anything. Deleting the database doesn’t fix the problem.

Stuck in a loop.

Welcome to the forum @Luca

Is this a small initial backup? That would be three files. What’s the destination type? Are any files there?
You can also inspect your backup Destination configuration. Use forward slashes, and don’t use extras.

About → Show log → Live → Information might be worth watching during the backup. That should show whatever Duplicati tried to upload, and might name the specific files that it didn’t spot later in a file listing.

If you think something weird is going on with the file transfers, you can take an Export As Command-line
Target URL, edit it to point to an empty folder, and pass it to Duplicati.CommandLine.BackendTester.exe.