Running Local Mirror

[Sajan Parikh]

I'd like to run a mirror for myself, just on our LAN.

I took a look at the following page, and am glad to see it's just rsync 
on a cron.

However, I had two questions.

How would I going about mirroring only a specific release, say Trusty.

The page mentions how much space is needed for the whole mirror, however 
if the above is possible, how much space would I need for just the one 
release?

Thanks.
-- 
Sajan Parikh