There are 6 sample videos that give a good example of PowerView features. Each of these 5 to 10 min videos have over 5K views and have received very good feedback.
If you are using SharePoint 2013 this resource provides guidance on determining your capacity plan for SQL.
Use Windows8.1 HyperV developer images. My experience moving from Spindle drives to SSD USB drives.
There are many ways to make a backup of working files quickly and painlessly. There are many tools available such as TFS, GIT or even SharePoint/Office 365, however sometimes the simple approach is the best if you just want a quick copy.
Microsoft has released Outlook for Mac and provided a hint as to what is to come in the next release of Office for the Mac.