PS2 Backups Logo?!!

You need a Hex patcher. If you examine the PBPX file somewhere in the first 20 sectors you'll see the text. Provided you replace exactly the same characters (so that the CRC remains the same), then you can make it read what you like.

Presumably you could do the same with ASA Patcher or Universal Patcher and change the text it writes in there.

I've never tried the above but there's no reason for it not to work because I don't think there's any trap code put in by the patch writers.