Good news! You can now import tasks and notes from your previous years right into your planner. This new feature can be found under the "Teacher" view, near your profile menu.
The idea is simple: You pick the school year and section you wish to import tasks and notes from, then pick the items kinds (or single pick them), and finally into which sections of this year the copies must go.
Only items placed in a period with an occurrence of the source section can be recovered. You can either import them all or select them one by one.
Copies will be placed in the same course occurrence number as the original. For example, an exam in the thirty-second occurrence of your source section will be placed in the thirty-second occurrence of the respective targets.