Storing wp-content on different ftp server

I am running a wordpress multisite installation and want to store wp-content folder on different server since my current server has 1 gb limitations but good uptime. Hence i want to know any way of accomplishing this.

for e.g. My site is running on example.com on sever1 but i want to store wp-content on example2.com which is on different server with different ftp server. All the files uploaded and plugins, themes,etc installed should also be uploaded on wp-content stored on example2.com