Can I access my time capsule away from my home wifi

Yes, it is possible, how ever you need a few tweaks

Here are the instructions:

Really pretty simple. That's if you've got the Time Capsule and your Computer set up correctly.

Time Capsule setup:

1. Open Airport Utility

1a. Open Time Capsule Base Station tab

1b. Put iCloud NAME in "Back to My Mac"

1c. Enter Password, then wait for activation (less than 1 minute normally)

1d. Open Time Capsule Disks tab

1e. Check mark "Enable file sharing"

1f. Check mark "Share disk over WAN"

1h. Password self explanitory

Computer (Mac)

1. Open iCloud in System Preferences

2. Put a check mark on "Back to My Mac", wait for actication (less than 1 minute normally)

Connecting to Time Capsule Disk from you HOME network or outside your home network ((INTERNET))

In order to connect to Time Capsule Disk off your local (home) network you must have an internet connection, if you do then do this:

1. Open Finder

2. In Finder open Shared if collapsed and double click on your Time Capsule name.

3. Double click your Time Capsule, enter password (if you required).

4. Once connected to your Time Capsule double click on your Disk to mount it enter password (if your required).

5. Done, remember the connection speed is dependent on your internet quality (broadband vs dial-up).

Obtained from: How to remotely access Time Capsule using iCloud and firmware 7.6.1?

It's OK to access files that are already on the Time Capsule from a remote location......but.....you would not want to try to back up files to the Time Capsule from a remote location. To do that, you would be relying on the "uplink" speed of your current Internet connection......which is going to be much, much slower than the speed on your local network.

Please, do not attempt to back up from a remote location using Time Machine to your existing backups unless you are prepared to have them become corrupted in short order.

First thanks for the good description! I'm already looking for hours to find a solution how to connect to my Time Capsule when I'm not home from my MBP. The only thing is that I can't find the check mark "share disk over wan". I've looked for it everywhere in the AirPort Utility but I still can't find it.
Hope you can help me!

If the "Share Disk over WAN" option does not appear, this indicates that your Time Capsule or AirPort Extreme is set up to operate in Bridge Mode.

So, you don't need to worry about that setting at all. For example, there is no option to "Share Disk over WAN" on my Time Capsule......yet I can access it from literally anywhere in the world with an Internet connection. This even worked fine when I was using the wireless on a cruise ship recently in the Baltics.

Start a new thread if you have difficulty, though.

Thank you very much! I made all the settings as they are above, I'm already home so I will try to connect tomorrow when I'm at work in a different wifi.
If it works (what I hope very much 😀) I'm really thankful for this thread!
If I have any problems I will ask them tomorrow.

When you say that you will try to connect from work........most business networks have firewalls in place that are going to make things very difficult to do what you want to do.

You may need to try to connect from the coffee shop or the bookstore to get things to work......not from a business network.

Well that's true, the only time I really want to connect to my Time Capsule is when I'm on vacation and I want to save my pictures there and do some backups. But you are right, I will go to Starbucks tomorrow 😀.
Thanks again!

Bob, I have a USB disk attached to the time capsule, and plan to access that, but if time machine is active, can you prevent it backing up when traveling? I guess you'd just turn it off in TC Preferences, right?