Is Garamond really web safe? Should I go ahead and use it? I know its not there in XP(Georgia is the fallback), however, what about other operating systems? Is it present in ma
Other than a very short list, you should not rely on everyone having the various font families on their computers.
Instead, try out Google WebFonts. In fact, use the search box on the left to find their Garamond equivalent. Works in all browsers (including older IE!) and looks great everywhere.
EDIT
Regarding your additional question, yes, the browser will look for the fonts in the order that you specify them, so putting "Garamond" before "EB Garamond" will show Garamond if available in the user's computer.