What some of us will want to know is how the backup plays on the PS2 without a modchip, Can you enlighten us further like:
a) PS2 model/country of origin
b) Do you boot off the copy (which is implied by your message)
c) Do you boot off something else and then swap?
d) Do you use the knofe/cog swap trick?

Answer to your question needs to be set into proper context to be of value to you.