Great show, especially enjoyed the music! As for avrdude from the examples

Save flash memory in raw binary format to the file named c:/diag flash.bin:
 	

$ avrdude -p m128 -c stk500 -U flash:r:"c:/diag flash.bin":r

Reading flash memory ...
Reading | ################################################## | 100% 6.90 s
Writing 19278 bytes to output file diag flash.bin

Avrdude done.  Thank you.

Of course, change -p to proper part, and -c to your programmer type