BiT v1.0.36
In the advanced options of a backup these three options are disabled:

(sorry for not having an English screenshot, my system is set to non-English)
It is not clear why and how to enable them.
In my case I'd like to use the option to limit the bandwidth of rsync (third option). AFAIK this is just a parameter you can pass to --rsync, so why can't I use this?
BiT v1.0.36
In the advanced options of a backup these three options are disabled:

(sorry for not having an English screenshot, my system is set to non-English)
It is not clear why and how to enable them.
In my case I'd like to use the option to limit the bandwidth of rsync (third option). AFAIK this is just a parameter you can pass to --rsync, so why can't I use this?