non-unicode link targets are not supported

[aawsome]

I create this as a new issue so it will be still visible after #57 is closed.

This is so far not supported in restic, see https://github.com/restic/restic/issues/3311

So, this can be only fixed after restic fixes it or by breaking restic compatibility. Until this situation is cleared out, this will get a wontfix label.