File Storage

Hi!
I was wondering how people store their graphic files?
My files were making my computer very slow… so I transferred them to a hard drive. Just wondering what other designers do?

I use cloud storage. I’m using SugarSync but I don’t like it so much…would consider Dropbox or others.
I know some designers do both an external hard drive backup (say once/year) and cloud storage.

I’m looking to buy cloud storage can anyone tell me what works best?
google, dropbox, OneDrive??