Unsupported Characters for Backblaze B2 (File Names Must not Contain DELETE)

Issue Description

The backup plan fails with the following error message: “File names must not contain DELETE”.

The error is returned by BackBlaze storage, once unsupported characters in filenames are detected.

Filenames can be almost any UTF-8 string up to 1024 bytes long, with the following limitations:

• No character codes below 32 are allowed
• Backslashes are not allowed
• DEL characters (127) are not allowed
• File names cannot start with "/", end with "/", or contain "//".

Resolve the Issue

To avoid this error, remove all unsupported characters from the filenames in your backup source.

Note that filenames can contain control characters that are invisible in file manager software:

but can be seen in log files:

Once you are done with renaming files, run the backup plan again.