How to setup and backup in Time Machine when there is only one hard drive showing? then other window open which shows internet written their and they says no airpot found searching for it....!2
and if i go to disk utility there is only one hard drive shows "machinetosh hd"!2
i have no idea what to do now.i want backup my pc.need help!
I m new on mac world
You need this:

http://support.apple.com/en-us/HT201250

Main thing: you need any other hard drive, whatever ssd, hdd, connected to mac by wi-fi, thunderbolt or usb.

Time Capsule is just one of the many variants.

You can make your backup on any device that you already have. But make a note that it better should be fully given for backup, no any other sided information on a drive, particularly when encrypting your external drive.