A UPS is an uninterruptible power supply. It is a device that provides backup power to a camera system in the event of a power outage. A UPS can run a camera system for a limited amount of time, depending on the size of the UPS and the camera system.
1. Most UPS systems are designed to run for a few hours, which is typically enough time to safely shut down a camera system.2. However, some UPS systems may be able to run for longer if they are specifically designed for that purpose.3. Ultimately, it depends on the specific UPS system and the camera system that is being used.
Frequently Asked Question
How long will a UPS run a camera system?
Which UPS is best for CCTV system?
So generally, the UPS power backup for security camera system could hold nearly 5 hours period of power cut, which is enough to deal with most power issues. And you may calculate the time your UPS for NVR or DVR accordingly.21 July 2021 
Typically, a 1500va unit provides approximately 18 – 24 mins on a 4-camera system and 8 – 18 mins on an 8-camera system. If you are looking for longer times than this, or if you need to power a 16-camera system, a 1500va unit is recommended for the surveillance DVR alone. 
It really depends on the camera system and how many UPSes are connected in parallel. Generally, the more powerful the UPS, the longer it will run a camera system. However, if you have a lot of cameras or a very high-powered system, you may need multiple UPSes to keep everything running smoothly.