Filecoin seems to be one solution... To be honest I would be more interested in a solution where you get to host as much data on the network as you host on you

Filecoin seems to be one solution... To be honest I would be more interested in a solution where you get to host as much data on the network as you host on your machine, or something in proportion, at different levels of redundancy. For example hosting a blogpost sqlite database file should be accessible to all hosts, since it will be never so big, but it can't be lost with a high enough level of redundancy.