I'm looking for a solution to store files such as PDFs, .docs, images and videos for entreprise purposes. We're a startup with 15 people who need to access those files in sync all the time. Sometimes from abroad. The solution must incorporate permissions management and if possible encryption. The more secure the better. We also want to be able to backup the data. All for less than 100$ per month.
Which infrastructure would you advice ?
Edit : I edited the question for clarity, by SMB i didn't meant Server Message Block, i meant Small and Midsize Businesses.
Edit 2 : I think i'm going to go with Amazon S3 and expandrive as a client for employees access to files.