One of the appealing new features that Microsoft has packed the Windows Phone 8 platform with is the SkyDrive integration, which enables users to back up their files into the cloud, while also being able to access them at all times.
SkyDrive in Windows Phone 8 is also connected with Office, so that users would have their documents synced to the cloud at all times.
To save a new document to SkyDrive, simply go to the Office Hub on the phone, go to Recent and hit the New (+) button, then select the type of document you want to create (Word or Excel).
After adding content to the document, hit More (…) and then Save the file. Enter a name for the new document, hit Save to list, and select SkyDrive. The file is now Saved into the cloud.