New server advice please

You might be able to use a nodebalancer for distributing load (or separate your services).. If you need storage but dont need SSD level speeds, cant you use something like an amazon S3 and mount it on your linode - although i'd only recommend it it for static stuff that isnt accessed too much.

a server is a computer program or a device that provides functionality for other programs or devices, called "clients". This architecture is called the client–server model, and a single overall computation is distributed across multiple processes or devices.