which version of alchohol is suitable for making ps2 back ups ??
The latest version is (almost always) the most suitable.
No version of alcohol is NEEDED to copy PS2 games.
Any burning program will copy them. Nero, Roxio, even the ISO wizard from Microsoft.
There is no soft-protection on PS2 games, and there’s nothing strange about the discs beyond the physical protection for which you need a mod chip.