Unfortunately, there is no up-to-date and comprehensive guide out there. I should write one i guess. I takes some tinkering. This is a good first start: https://www.makeuseof.com/tag/turn-nas-windows-share-time-ma... If you’re using a USB drive, I recommend to make the first backup while directly attached to save some time. Also if the server is a Mac (and I believe there are ways to do that with other OSs too), you can simulate a time machine capsule. Now whenever I am in my home wifi my MacBook does automatic backups.