@Thors Nuts…
hehehehe… the nuts of gods.
I digress…
There are a couple of ways of saving things quickly, the first is simply doing “save as” and not renaming your object, quick and simple.
Even quicker is QuickSave which is at the top of the ZBrush window on the right.
This will VERY quickly save your whole project.
Using Save As in the Tool pallet will save the object you are working on at the moment, meaning anything you have on the canvas and any subtools.
Saving a Project is for when you have a a lot going on, for example you might have a tool with many subtools on the canvas, and a lot of other tools loaded as well but not active. This will create larger files but is often a good option if you are actually working on more than one thing. For example say you have made a person and a chair but have yet to append the chair as a subtool because its not done and the person would get in the way.
Saving a Document will flatten your 3D stuff, or offer the option to save the tool (objects in ZBrush are called tools).
Basicly this is a picture of what ever you are looking at, you can also export images from the same menu in various formats.
QuickSave is very cool in many ways, you just need to remember to NEVER hit Init ZBrush in the Preference Menu, or Default ZScript at the top of the window, both seem to delete ALL of your QuickSave files and THAT is not much fun.
QuickSave can be configured in the Preference Menu under oddly enough: QuickSave.
The files that you save using this automatically go into a directory easily available via LightBox, and while you can only save up to 100 things using this you can always back up the directory if you need to.
QuickSave is automatically running, and while this is terrific it can be annoying, I have it set to wait 600 minutes so it doesnt get on my nerves, I just need to remember to hit the button once in a while.
On top of all that there is also Export, this is great if you need to get your objects and stuff into other programs and can save in a number of different formats.
I hope that helps!