sources:
- https://thatvirtualboy.com/2016/11/03/send-time-machine-backups-to-a-vm-hosted-in-windows/
- https://www.howtogeek.com/276468/how-to-use-a-raspberry-pi-as-a-networked-time-machine-drive-for-your-mac/
sudo vi /etc/wpa_supplicant/wpa_supplicant.conf
here you insert something like network={ ssid="The_ESSID_from_earlier" psk="Your_wifi_password" } and then sudo wpa_cli reconfigure