At the end of the school year, you'll need to wrap up your Classroom. Much like cleaning the the physical room, you have digital work to complete. There are three parts:
1) You need to return all student work. This is important to be sure kids get rights back to the work they created.
2) Turn off Comments! If you don't students can still have discussions in your classroom, all summer long or even during the next school year.
3) Copy and/or Archive your classroom.