"Backup" refers to making a copy of important information or data so that it can be restored in case the original copy gets lost, damaged, or deleted accidentally. Full definition
Camera Source is your one stop shop for backup cameras and accessories. (camera-source.com)
I don't know if it's true and the regulations are like that, but I find the thought of having to have thousands of backups of the exactly same data horrifying. (money.stackexchange.com)
Hire a leak detection company with warranty, use the camera as backup. (biggerpockets.com)