Looking for a relatively cheap camera system

Hello selfhosters!

I have what is hopefully a simple ask. I am looking for some outdoor cameras for my sister, who is not at all tech savvy. I am, to an extent, and I’d like to get her set up with a small, remotely-manageable system to view and record the outside of her home. I’d wager there’s a plethora of selfhost software that can be run on a number of systems (I’m thinking something cheap like a Raspberry Pi), to connect to an external HDD for camera storage.

I’m also looking for camera suggestions for this purpose. Wi-Fi cameras are ideal, since we don’t have the means to run ethernet for PoE.

Thank you for your time, and I hope you all have a wonderful week :)