FCS teachers have asked the FCIT several times both last year and again this summer if one can copy a Google Classroom class page. The answer is yes. Google Classroom added this feature last Fall and many undoubtedly will find it useful.
A word of caution, only use this If you are sure you want to teach this year’s course with very few changes to last year’s course. If you are making even moderate changes, it may be easier to reuse posts from last year’s class or use this terrific idea.