Wow. I feel like an idiot. I’ve had an Apple Time Capsule at my house for maybe close to a year now, and have just today realized how easy it is to access it from my office.
Disclaimer: this works for me, but I can’t promise it’ll work for you. The steps I’m showing are exactly what I did to get it to work.
The first thing I did was discover my home IP address. The quick and dirty way to do this is to just go to a site like this: http://whatismyipaddress.com/. Right at the top it shows your IP address.
Disclaimer Two: If you have Comcast Cable internet or similar, it’s possible that you do not have a static IP address. This means that occasionally, it could change. If it does, you’ll need to re-acquire your IP address this same way every once in a while. OR, you could use a DNS forwarding service like this: http://www.dyndns.com/. At the moment, I’m not worrying about it.
Next, go to your office. Open Finder (sorry, this is mac advice only) and press CMD+K. Enter afp://your.ip.address.
From there, you’ll get a login window with a username and password. You can leave the username to be whatever, and just enter the admin password for your Time Capsule. Hit enter, and your remote time capsule will be mounted and in your finder. So. Awesome.
I added mine to my Favorite servers, so I can quickly pull it up again later if it becomes un-mounted.
Hope this helps.