Our site runs on a 2GB, 2 Core VPS with 50GB of storage for £25 a month. We also this year broke off our database into a specialised database server which has sped up our site no end and means the VPS can focus on compressing images and serving our users content faster. 

We expect that our 50GB shall be used up one day, our site currently uses shy of 2GB. 

Our site has a custom build photo plugin adapted from the default photo plugin. I was wondering though that if we bought a storage box from, say Hetzner would it be possible that our site could use that for storing photos and the base content stays on the VPS? The storage box uses FTP to connect to it.

Does Oxwall have a built in option for something like this? I understand that there is a feature for linking to AWS but their prices far exceed what we can budget for. The alternative is we customise our plugin to use FTP details which we will need another developer for.

Thank you very much for any help or ideas you can provided us with!