For those not diametrically opposed to the Mac platform there is the amazing Time Machine...
www . apple . com /macosx/what-is-macosx/time-machine.html *
...it's proven itself several times (including yesterday when a Photoshop droplet overwrote an image I'd forgotten to rename after considerable editing, and Time Machine gave me my old version of that file back in less than a minute).
* since I still can't post links
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