Symptoms

1. You create a file-level backup to cloud. Some filenames in the backup contain non-ASCII characters like ä, ü, ó, ż, ę or others, Cyrillic letters, Japanese letters etc.
2. You download the archive from the cloud.
3. You unpack the archive.
4. Filenames containing special characters are not displayed properly:
   

Cause

Decoding issue in Windows Explorer.

Solution

Unpack the archive with 7-zip - a free file archiver: