Support mirroring of repositories for geographically distributed teams

There exists some demand for the ability to support mirroring of repositories across geographies (and therefore Stash instances). This could take a number of forms:

• Read-only mirror
• Transparent proxy
• Two-way mirror
• other...

---- Original request ----
In our company we want to use cascading git repositories:

We have Repo1 on Server A.
Now I want to clone Repo1 on a Stash-managed Server B.
Any developer near to Server B clone Repo1 from Server B on their local maschines.

Are there any possibilities to realize this scenario?
At this moment I'm not able to create a "normal" repository within Stash.