Update backups.rst
Python syntax and variables
Briefly flesh out Virtualization 101.

Add mention of private and public cloud, as well as defining terms.
Lists and Dictionaries

Added descriptions and examples for lists and dictionaries.
Basic function definitions and usage
Merge pull request #137 from andrew-timmes/patch-1

Update backups.rst - RAID todo
Merge pull request #139 from mikalstill/master

Define cloud terms in virtualization 101
Merge pull request #140 from jivid/master

Python intro