Bandwidth requirements for mirroring relay directory

[john smith]

Greetings!

Tor Ops are encouraged to mirror the relay directory if they have
sufficient bandwidth.

Can anyone advise if there is some kind of minimum amount of bandwidth
that can be used to mirror the relay directory?

I am assuming that I would forward the relay directory mirror port in
the same way that I have forwarded my relay port.

Regards,

John Smith (Tor relay freeflow)