can i backup one of my original games in the xbox hard drive and boot it from there with out any modchip? if so can you give me a link on how to do it.

Check out the Exploit Forums.

you are going to need a hombrew app to do so. for the hombrew apps to run you need either the above mentioned software exploit or a modchip with a hacked bios.

Step 1: Search For Tsop
Step 2: Read Read Read
Step 3: Read Read Read
Step 4: How To Install EvoX
Step 5: Read Read Read
Step 6: Install New Hdd
Step 7: Read Read Read
Step 8: Install dvd2Xbox

As You Can See You Have Big Time Reading In Front Of You