I need IT backup/storage advice!?

You could use a couple of TB HDD, however most Business dont use hard copy backups in case of theft. It all depends what work needs to be backed up. The best thing to use is online storage, then if anything goes wrong or you need to access info from somewhere else in the world etc then its easy to do and you dont have to take physical backups.

You can find lots of online storage sites for small Business that would be cheaper than buying HDD etc. Do your research and try and look at reviews

If you have multiple workstations to back up and your info is valuable get a (NAS)network storage hard drive enclosure with 2 hard drive bays that supports raid. Raid is essential for backing up valuable data as it provides you with redundancy that a single drive enclosure cannot. You can buy these enclosures with raid pre installed to make your life easier. A server is another option though this would require setting up and regular maintenance, if you are a small business go for the NAS enclousre as its cheaper and less fuss.

You can buy a 2TB or even a 4TB Hard drive for about £200 and £300 , the data is fine for years and is a box like a server size computer.

Portable/External Hard Drive's are the way to go man. Yes they do keep the data even if it isn't plugged or used for ages.

I suggest you consider a Drobo Network Storage device.

This unit is self managed and easy to set up.