Online File Storage? Or Local Networks?

Hi everyone

I don't know if anyone can help with this, but I thought I'd throw it out there and hope for the best! It's been a LONG time since I worked in an office so I have no idea how most people have these things setup...

I'm currently running my online business from an office in Manchester. I employ James as a full time manager, and this means we're always working on files at the same time.

Currently we have a local network setup, and all our files are stored on my PC. James connects to the network and he can then access the files too.

This week I'm having a Mac Book Pro delivered and I'll be working on this in the office. Initially I'd planned to just plug this into the network and work on the files that are currently stored on my old PC.

However, in the afternoons I like to head out into town, find a quiet spot in a coffee shop or bar, and crank out some content.

Does anyone know of a reliable and secure way that I could be working on some of our files on my Mac Book while sat on a beach somewhere (assuming I have Internet connection), and how James could also be accessing the same file in the office?

I'm imagining a world where we both access the files on an online network, or where we both host the files on our computers and then sync up somehow when I return to the office.

Is this possible? In an ideal world I want to avoid having multiple versions of the same file kicking around on portable memory, as I know from experience things get complicated after a week or two.

I have no idea if this question sounds flat out crazy, or if the solution is very simple

Thanks in advance for any suggestions!

Lee McIntyre