WARNING:DVRs are outdated. Your options are: 1. Upgrade to a TVI format - TVI DVRs cost less than analog DVRs, are backwards compatible with analog cameras, and can also record HD TVI cameras. 2. Replace your existing system with an IP system. This will require both new equipment and re-cabling with CAT5 ethernet cable. IP cameras are the way the industry has been headed for some time now and are your best option. 3. Get a Hybrid DVR/NVR. Hybrids allow you to use your existing analog/TVL resolution cameras but you'll be able to network in high def IP cameras. For other guides, please consider: To get a better understanding of the new technologies out there, please read this technology comparison To better understand why TVL definition cameras are being abandoned and aren't what they are cracked up to be, please check out these images. 16 Channel DVRs with Automatic Footage Backup DVRs that automatically backup their footage onto your computer or NAS? Monthly Cost: $0. Now, that’s brilliant.