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.