Rollback changes to Salesforce

I am just starting out with a moderate web development job at Salesforce for my company and I am looking for information about the deployment process. Now it looks like we will be doing a lot of custom work using visual power and vertex. What is interesting to me, if I screw something in my org organization (data or metadata), is there a way to return to a snapshot or a previously released version of my organization that is still working? With mediocre development tools, I worry that when errors occur, I will not have a good quick solution to the situation.

I read about various ways to configure the source: How can multiple developers work efficiently on a single force.com application?

But I did not find that anyone was walking the process, essentially undoing a set of changes or changing branches. Are the salesforce built-in protections good enough that I just don’t have to worry about manufacturing errors? Should I just not worry about returning a set of changes?