What do I need to do if I am away and without my home computer and I need to access my cloud files? Can I connect using any other computer in another part of the world?
You will be able to access Ubuntu One, Dropbox, Sugar Sync, 4shared, Mediafire, Google Drive and most other cloud services through their websites. From there, most of them will allow you to rename, relocate, open, download ro execute the files with password permission. This will only work with an internet connection, if you are unable to establish such a connection, I recommend using a USB which can easy match 2-20GB Storage space.
You can Login through Ubuntu One Cloud Storage Account to do the require modifications from any Computer and from any part of the world.
As below image , you can view your U1 files and Devices used . It also avoids installing U1 application to view your files ,since you can Access it Directly through Web Page. For Folder you will get Sharing options .
If you select individual files through the Folders, it also provides options from the Right-side corresponding
You can Publish
For On the move access :
Android applications for Ubuntu One Files app and Ubuntu One Music app
iPhone applications both for Ubuntu One Files app and Music streaming app for iPhone. (iPhone app also works on the iPad)
Web-based common FAQ's questions
You can access your files that you have uploaded to the cloud (I am assuming Ubuntu One or Dropbox). Just go to their respective website, log in, and you should be able to access your cloud files anywhere in the world, as long as you have an internet connection.