We have a vacation home in a fairly remote wild spot, so we have devised a number of surveillance solutions over the years. Sounds like you need something similar. Maybe our experience can help you.
We use IP cams both inside (eg, a PTZ on a window ledge, can be remotely controlled to look inside too) and bullet-style (under the eaves), and outside on the roof, both hardwire connected and wifi. We even have a $5 USB webcam on the desk next to the PC, facing out the window.
I believe the best brand is Foscam in all configurations (but not cheap). One amazingly reliable wifi Foscam bullet style has been outdoors for nearly 5 years now, but lacked night vision. We recently got a few Scricam bullets that have excellent night vision but their reach (distance and width of motion capture) is quite limited. Will not buy them again, cheap and unreliable.
Fortunately we have reasonably good wifi from a roof antenna and we leave a desktop computer inside connected 24/7. We use Netcam Watcher Pro to record motion and set the software to save the videos to a private Dropbox folder which is immediately auto-updated to my local computer folder no matter where I am in the world.
Netcam Watcher Pro is excellent and very reliable, does not offer all cam configs however, so we also use Security Monitor Pro, but it is not very reliable. It will save 500 photos of a blade of grass waving in the breeze, but not several people moving around a double-cab truck parked right under the cam (happened again this week).
We access the remote computer with GoToMyPC to check settings, adjust PTZs.
We also use small stand-alone game cams way down the drive at the gate and also facing the house tucked obtrusively among bushes, rocks. Most take 6 or 8 D batts and last 8-12 months or more. Water tight, motion detect, night vision. Downside is you must physically open the cam to extract the sandisk (32 to 64GB is sufficient) to view the shots. We get some amazing game shots with these however, as well as excellent shots of vehicles and their license plates. There are more expensive ones with wifi, but we have not bothered with those.
Cheers
Mike
PS: I happened on this forum while searching for better video security software. I think I found it...