The role in practice
An entrance can continuously require proof, while a quiet storage space with events can be included. The difference also determines how much space the NVR needs.
Recording is a choice per camera and period; the same setting on each channel rarely suits every room.

An entrance can continuously require proof, while a quiet storage space with events can be included. The difference also determines how much space the NVR needs.
Determine per channel what you want to find later, when movement is relevant, and how long images should remain available. Check any weekend or closing hours.
Create a clear plan with recognizable channel names and establish when an event starts recording. Do not choose only event recording if non-reported context can also be important.
Create a test event in any type of time interval and search the recording back in the NVR. Check after a few days that the plan did not only work on the first day.
That depends on activity, detection and camera settings.
Yes, but assess the impact on storage duration and evidence coverage.