Why is everyone doing a fresh install?
I just got my iMac 3 weeks ago, and wondering if i need to do that.....and i am worried about my photos on there which might be lost ! lol Is Time Machine THAT good? How do i check it has backed up my photos?
If your mac is only 3 weeks old, it's probably not worth the bother.
In answer to your other question - yes, Time Machine is e-mazing.com If you told it to back up your drive then yes, your pics are safe. To check, open your photos folder, then select "enter time machine" from the little icon at the top. You can scroll back through time. Note that this is not so impressive if you use iphoto as all you'll see is the iphoto blob of data!