Will it be accurate?
CloneCD will not handle your data in any way. If you copy the content of a data CD, you will receive a completely valid and working session of that. Yes, the copy is far from perfect, but there's no other alternative for working with a CD.
The process of copying will generate a very low quality image though, which will have some problems with encoding. We recommend that you get a professional tool for creating quality backups. CloneCD 50e0806aeb kalfea