can I backup a perfect gamecd of an original disc of a specific game using clonecd?
That is the purpose of CloneCD so yeah…
There are exceptions of course, use Alcohol 120% for SD 2.8 and Blindwrite/Alcohol for SecuROM 4.
However you cannot get away from the ATIP check that many games use. You must Hide CD-R Media or run from DVD/CD-ROM.