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Or buffering.
Buffer a higher quality feed to a drive, which in turn gets read off to a video tape with the dropped frames 1 hour later.
If a burglary happens, then you hit a button, the buffer stays on the disk and copies to a backup tape for emergencies. You get hi-quality + the lower reference to the incident.
Anything after that and you at least still have the typical security feed.
If you were a software wiz, you'd write recognition software that would take a hi-res snapshot from a cheap 3mp camera when it detected a face turned in its direction.
Add that to a grainy, skippy security video and you have a good id reference, plus a reference to the suspect's actions.
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