If the threat model is real burglary (not the hollywood kind where expert thieves steal everything in your house), storing footage on a NAS somewhere in a close

If the threat model is real burglary (not the hollywood kind where expert thieves steal everything in your house), storing footage on a NAS somewhere in a closet or in your basement is fine. If your threat model is this fantasy burglary, the burglars are going to know to simply cut your Internet line before they rob the house to render the cloud-connected shit useless. Then they will just steal the cameras to ensure no local caches push data back up when the Internet is restored.