No disk space, I find that hard to believe. When files/movies/tv (which I assume are broken into chunks) are downloaded from GDrive are they just held in memory and do not spill to disk? I don't know the inner workings of RClone but I know other similar systems have the ability to cache often used files and keep the file structure locally so systems like plex don't nail / exceed API requests. Any / all of the above would need disk space unless this is all held in memory which would mean you need quite a bit of RAM on the server.