These cameras can save video on a microSD card, an external hard drive, or to EZVIZ's cloud service all at the same time, so you'll have multiple backups..
Brad's Deals Editor Michael,
Get two EZVIZ Mini O 720p HD Wi-Fi Home Video Monitoring Security Cameras for $69.99 with free shipping at Newegg. This is the lowest price we could find for a set of these 720p cameras by $26. They connect to your home WiFi network and can stream video or two-way audio to a mobile device or your computer. They're also Amazon Echo compatible. There is no sales tax (except CA, IN, NJ, and TN).