hi I Want Help
I Want Use Another PC Or Storage
And Make All new Data Save automatic
to this storage
And When IT use Again
Microtik Take From THis Storage Not
form The Internet
So I can Save Bandowith
And Web site Can Open Like Off LIne
THanks FOr Every Thing

I hope here is your solution.
http://wiki.mikrotik.com/wiki/Manual:IP/Proxy