Good backup solution to run in background for a different machine?

Situation:

1. I have a macbook I want to regularly backup that's in a different location
2. Want a family member's Windows 11 machine that's always-on running as an office machine/web browser, but with a lot of storage, to be able to receive backups from me.
3. Want data to be encrypted on the Win11 machine, and don't want that machine to have to launch any new apps or reboot

I was thinking about something like openSSH + rclone to copy data over, but wanted to hear what ideas you guys have.