Unsupported Characters for Wasabi (Couldn't Parse the Specified URI)

Situation

A backup plan fails with the following error message: Couldn't parse the specified URI. The remote server returned an error: (400) Bad Request.

Cause

The error is returned by Wasabi storage upon unsupported symbols detected in filenames in the backup source.

Wasabi does not support 4-byte UTF-8 characters (such as emojis), so an error is returned.

Solution

Remove any unsupported symbols in filenames in your backup source. The easiest way is to rename such files.

Mind that in case of any control characters you may not see them using Windows Explorer. It is recommended to get rid of such characters using any hex editor of your choice