I see..Thank you @Stephen for your answer I’m using amazon lightsail for now, so it’s pretty cheap I have 40GB ssd with my 5$ package. Probably enough for the first year.
Still I wanted to find future solution for that because with the technology today (like I do manually on my website) I minimize 3MB images into 60kb~ (I change the resolution as well) If i’ll do that with my discourse my 40GB will last forever! but i guess it’s not so simple to do it automatically or even manually 