Although web based security systems are not as "secure" as CC systems, the whole purpose behind it is so that the scumbags cannot destroy your equipment. There have been lots of cases where the ****heads get in and realize you have a system in place, they track down all the wires and smash the system to pieces. If you are not backing the video up to something outside of the CC system, then it is lost forever. Even if you back it up to some kind of harddrive, there is still a very good chance they will find it and break it. What usually happens is the perps break in and start doing **** before they realize you have a security system. That is when they are pretty much forced to find all the components and trash your system.
My system uploads the data to an online file storage site. This way, they can destroy my entire system, but I will still have footage of them. So long as they are not wearing masks or something, I will have pretty clear pictures of them. Not to mention, I have a camera right at the receiver, so when they track down the box to destroy it, they have no choice but to look right at the camera.
I have a similar system from costco as well. It is a very good system for the price. I have cameras inside and outside. In total I have about 16 cameras setup. I have found that security systems like ADT do very little to help you out. They might serve as a deterrent but nowadays, there are so many ways past it that good crooks are not bothered by them anymore. Cameras will at least help me identify possible culprits.