Free roll back software?

With Mac OS X you can use backup software to roll back to a previous state, especially with Time Machine. That is one of the reasons it was introduced.

Time Machine FAQ

I have to agree

I tried it yesterday and it works.

Thinowns said:

I used to use the Comodo time machine.

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Comodo Time Machine is Windows software. If you're looking for Windows software, this may not be the best place to ask.

Thinowns said:

I don't need backup software.

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Everyone needs a backup. Whether you do it manually or use software to do it for you is up to you.
As already said, if you did use OS X's Time Machine backup software, you would be able to "roll back" using that.

However, the need to "roll back" the entire drive is much less on OS X than on another well-known OS.

Take a look at Faronics Deep Freeze, it's not free, but in looks like the one year licence is pretty inexpensive.