The Sony PlayStation 2 has sold more consoles than any other console in the history of video games. Since 2000, Sony has sold more than 140 million units. In 2005, the company released the PlayStation Portable (PSP) to further promote the PlayStation brand. The PSP can actually connect to the PS2 via the USB interface that both the PSP and PS2 utilize.
Turn on your Sony PSP and wait for the PSP operating system, known as XrossMediaBar (XMB), to load up.
Connect the miniUSB cable to the PSP. The other end of the cable will be a regular-sized USB 2.0 plug.
Connect the other end of the USB cable to one of the open USB ports on the front of the PS2.
Select "USB Connection" from the PSP main menu. The PS2 will now be able to access the PSP.
Use the PSP to back up your PS2 game data.