The amount of traffic to and from your site, files uploads, email etc are measured as Bandwidth.
The space your files and databases(s) useon the server is measured as storage.

We offer 3 levels of hosting with prices dependent on your use of the server resources:

Band A: Up to 500MB storage, up to 2GB bandwidth (per month) £108 p.a.

Band B: Up to 1GB storage, up to 8GB bandwidth (per month) £160 p.a.

Band C: Up to 2GB storage, up to 15GB bandwidth (per month) £240 p.a.