Pin your files
Office 2013 makes it easier to access oft-used files and folders. Office 2013 allows you to pin files you need quick access to on the start screens for Word, Excel, PowerPoint, and other office apps like Access.
In Excel, for example, hover over the list of recently opened documents that the app displays by default. On the far right of each document name you’ll see a pin icon. Click that pin and the file will jump to the top of the Recent list.
Default to Dropbox, or anything else
In the window that opens, click Save in the navigation column on the left. Look for the option towards the bottom of the Save documents section that says Default local file location. Click the Browse… button next to it, navigate to your cloud storage provider’s folder on your PC, and click OK. Close the options window by again clicking OK and you’re done.
Now Word will automatically offer to save your documents to your cloud storage folder by default. Once again, the rest of the Office suite offers similar options.