How does the device record or store the video footage once the local memory hits the max storage?

SENS8 only records video when unusual activity is detected. The video is stored in a built-in 8G memory which can save about 800 1080p HD video clips. When the local memory gets full, the oldest videos will be deleted to make room for newly recorded ones automatically. Also, if you link your SENS8 to your Dropbox/Google Drive account, the recorded videos will be uploaded simultaneously to your Dropbox/Google Drive which is absolutely free.