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I was trying to make some avatars out of some of my images and needed to resize them. I did so in Preview in Yosemite 10.10.3, and had before as well in Snow Leopard. There was no 'save as' option, so I did not save my changes because I didn't want to permanently alter my image. There was no 'undo' feature or 'cancel without saving changes' option either. What gives with this? I can't go back and take that picture again and now it is a low-res grainy mess when I try to resize it to original manually.

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Changes to files are saved automatically when you close, or automatically in the background.
If you don't want to alter the original image, duplicate it first with ⇧⌘S (File → Duplicate), or use ⌥⇧⌘S Save as… (File → ⌥Save as…).

To revert to the original version, open the file and choose File → Revert To and select a revision.

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