You don't necassarily need internet unless you want to be able to access the video from a remote location. If you have an old computer and a wifi router you can still set it up to record to the computer (with additional software) but unless you have these items laying around doing nothing, it would be more economical to purchase a hardwired system that comes with it's own dvr. Either way you would still have to be onsite to check the video.
You will initially need to hard wire the camera into the Internet to set it up but once it's done you can disconnect the Ethernet cable. However you would still need a wi-fi connection to operate the camera from your computer or iPad/android etc. My advice would be to either install the Internet to the cabin or if this is not possible you would need to look at a different system. An ip camera system will always need some sort of Internet connection.