If the Canton PD surveillance video DVR overwrites footage after 30 days...

Why is there existent footage from January 1, 2022? This footage was turned over to the defense recently. Does Canton PD, or their system, save footage from the first day of the year, for some reason?

Why is there existent footage from 1:34am on January 29th, 2022? When someone at Canton PD presumably saved all the relevant footage from that day, did they include hours that were way before anything relevant presumably occurred?

Why is there existent footage from February 1st, 2022? This footage showed the inspection of the Lexus by the MSP, and was an exhibit at trial. Did someone at Canton PD know the Commonwealth would want that footage, and saved it accordingly? Or did the Commonwealth request it and receive it before 30 days had passed?

Why is there existent footage from February 2nd, 2022? This footage showed the removal of the Lexus from the sallyport, and was an exhibit at trial. Did someone at Canton PD know the Commonwealth would want that footage, and saved it accordingly? Or did the Commonwealth request it and receive it before 30 days had passed?