Hello,
Thank you for posting in the Microsoft community forum.
In general, using special characters at the folder level can cause problems with Windows server systems, including during backup or synchronization.
Some special characters have specific meanings in the file path, which may cause file path resolution errors. For example, a backslash () is used in Windows to separate components of a path. At the same time, backup and synchronization tools may not properly handle files or folders containing special characters, causing these operations to fail.
According to the File Naming Conventions, the Windows operating system does not allow the use of certain special characters in file and folder naming. These characters include: <, >, :, ", /, , |,? , *
In order to ensure the normal operation of the system and application, it is recommended to avoid the use of these special characters in folders and file names. For more information on naming rules and restrictions, see this article: Naming Files, Paths, and Namespaces - Win32 apps | Microsoft Learn
I hope this helps.
Best regards
Jacen