Screen recording software that can record continuously like an NVR

[CursedLemon]

Hey all, just wanted to know if anyone has heard of screen recording software that can record in the way that for example an NVR can, where it records continuously but dumps data older than a certain interval, e.g. an hour or a day. The intended purpose would be for troubleshooting intermittent computer issues, attempting to capture trouble behavior when it occurs and the lead-up to it without taking up huge amounts of space.

[HaleyWang0909]

Try OBS Studio. It has a Replay Buffer feature that can continuously record screen or game footage to the computer's temporary memory (RAM), constantly overwriting older recordings. When an exciting or interesting scene appears, you can press a shortcut key to save the recording in the scrolling buffer to your hard drive.
https://obsproject.com/forum/resources/how-to-setup-instant-replay-in-obs-studio.613/

[The_Doman]

You should search for:
Google: Rolling desktop recorder

You could use FFmpeg to record your screen/desktop and do something similar.
FFMpeg: Capturing Your Desktop / Screen Recording

For example with a simple batch script you can capture your desktop, even multi-screen, with a "primitive" buffer of 5 minutes.
Works surprisingly well.

ScreenRecordRolling.bat

REM @echo off
TITLE Screen Recording Rolling
:loop
del output_old2.mkv
ren output_old1.mkv output_old2.mkv
ren output_current.mkv output_old1.mkv 
ffmpeg -loglevel quiet -t 00:05:00 -f gdigrab -framerate 30 -i desktop -c:v libx264 -crf 20 output_current.mkv
Goto loop

Or using filenames with date/time:

ScreenRecordTime.bat

REM @echo off
TITLE Screen Record Timestamp
:loop
FOR /f %%a in ('WMIC OS GET LocalDateTime ^| find "."') DO set DTS=%%a
set CUR_DATE=%DTS:~0,4%-%DTS:~4,2%-%DTS:~6,2%
set currdatetime=%time:~0,2%%time:~3,2%%time:~6,2%%time:~9,2%
set "currdatetime=%currdatetime: =0%"
ffmpeg -loglevel quiet -t 00:05:00 -f gdigrab -framerate 30 -i desktop -c:v libx264 -crf 20 output_%CUR_DATE%_%currdatetime%.mkv
Goto loop

Then you can make something to delete files after certain time/days?
Google: batch delete files older than X days