Summary
We went through an important process in this chapter, and one that is likely to come in handy for an Administrator. Understanding the way this process works is very important. By making regular System State backups, the battle is already half won. Although restoring deleted objects and users is possible, and not all that difficult once you know the right steps, it is important to be aware of one's actions within the AD. As mentioned at the beginning of this chapter, most user and object deletions are human errors, and we should look at mitigating this possibility, by providing better training, documentation, or access controls.
For further reading, Microsoft's Best Practises for managing Windows networks (http://technet.microsoft.com/en-us/library/Bb727085.aspx) is highly-recommended. It describes, in great detail, ways to prevent mass deletions from happening, and describes the tools or processes to be implemented in order to do this.