Recurring auto-backup of internal database, why?

What is this and why is it happening so often?
I’m also getting ‘exception occurred during async write operation’ on my clients intermittently, which I think tells me the gateway is running slow. My RAM was running at 75%, so I’m giving the VM more. Going from 4 to 8. This doesn’t look like its related though.
Running 8.1.2; 20 or so clients, lots of DB stuff going on. The server reboots every Sunday night.