How do I do wireless backup without wireless network?

Question

My school dormitory doesn't allow LAN, hence I can't extend my network through Time capsule (TC), which acts as an airbase.
Nevertheless, I can sign-on wirelessly to school network, so I don't really need to get online through TC.
However, I do wish to wirelessly access TC content, and be backup via TC.
I read from couple blogs that mentioned how, through internet cable, I can set up TC
and choose manual set up - extend network, and do a auto sign-in with school network.
But with my school, it doesn't really allow that.
Therefore, I'm here inquiring, is it possible for my computer to automatically detect my TC and be back up
even when TC doesn't have internet network.
Thank you.
Tai.
Cell: 626-264-0048

Answer 1

TCLMAC wrote:
thanks, the problem indeed is,
there is no ethernet jack available. that's what i meant by, "doesn't allow lan"
There is an ethernet jack in the TC.. 3 of them for LAN and one for WAN to be precise. Assuming you have a MBP i hope it is one that still has a jack.. therefore there is a jack on both.. all you need is an ethernet cable between them. Get internet by wireless.. and TC connection by ethernet. Do both at the same time by using a different IP range and fixed static ip on the Mac. You will cause no interference or issues to other residents. Just turn off the wireless in the TC. 
ah, the problem sounds so desperate.
Why can't my macbook just talk to my TC directly, and wirelessly...?
Of course you can connect to the TC directly (that usually means by ethernet btw).. and wirelessly,, yes of course. just not at the same time as the internet.. because your internet service is designed by geniuses for idiots.. who would connect up dhcp servers and bring down the whole network.. who would setup wireless routers in every room of the college when there are precisely 3 available non-overlapping channels for wireless.. at 2.4ghz.. yes, only 3.. so figure out how well that goes with all the residents packed together in little rooms.
Apart from interferring with the network your college provides.. will cause so much interference with each other.. they designed a login web page system that requires a computer to login.
You can do it.. even simultaneously to the internet system.. use a usb wireless stick.. but use 5ghz.. and you will probably need a different AP to prevent the TC revealing your presence. Since running it is not allowed. And any decent admins will have you tracked in no time. 
If you can live with the consequencies.. and no need to treat fellow residents as important at all as long as you get connected to your TC.. go ahead. Having done IT admin.. that is why we give up.