What is the minimum hardware requirement to be a host/node of Sia network?
Any desktop or laptop less than 5 years old should be good enough. I don't think a RasPi is going to be enough, but anything with a decent amount of power should be enough.
Then it will be really useful to have all my data locally too and running some sync software which will check status of my files and in case some file was deleted from all hosts it will inform me and I re upload file from my local disk.
This is not something we'll be able to make in the next 2 months, but perhaps we can do it in the future.