I guess we don't translate it and we only pronounce it in Czech. For example: The data is saved in the cloud = Data jsou uložena v kloudu. If it's not the case I hope someone correct me.

I agree with Tomas that we use the same word, but I think it is mostly written with c (cloud, data jsou uložena v cloudu). I don't remember I have ever seen "kloud" written with k.