ps2 cd games

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I own a NSTC ps2, want to get a modchip,2.5 neo installed.Just wondering if all cd games can be backed up.I keep hearing people say that you have to apply patches to games etc. Can anyone make it clear for me.By the way has anyone heard of the memory manager apparently it works with booting backup just like gameshark but alot cheaper.Heard it loads games quicker as well.If anyone has one or knows anything about it can you reply. THanks all