I just had a hard drive die and it is putting my system in a continuous boot loop. I can replace the drive but I find this as a good opportunity to upgrade it with a 4K system. The current CAT5E cables, HDMI(50') and mouse cable (50' with repeater) should work. I have a 4K monitor sitting in a box.
I ordered a QSEE 4K 12 camera system from Costco since it's now $200 off. ($1600)
Hopefully it isn't the 4TB hard drive that died. That way I can move it to the new one and double it instantly. The other drives I should be able to reformat and get them working again. I can resell the old system to recoup some of the cost.
Now I have to figure out which cameras I have added wide angle and zoom lenses that I can use in the new system.
As for where to mount cameras I would install one toward the front entry and one behind. This is most likely where anyone would enter. You get views in and out.
Next is your vehicles. I have two on the driveway one on the right looking left another on the left looking right. I will increase this with the new system.
An overview of the front yard. This is mounted high and can see everything.
Other access points. One above the back door and another above the Bedroom door.
Overhead of back yard. I can see what my dogs are up to from my phone (new system)
Freeway view. I can see how traffic is in the morning before I leave for work (new system).
Most cameras come with a 3.6mm lens. They can be replaced with 1.8mm to 12mm if you need wider angles or a zoom depending on your needs.
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―Han Solo to Luke Skywalker, while donning TK-422's armor.