Of course all your hard work will help you next year!
If you have uploaded content to Schoology that you plan on using again next year, all you have to do is save it to your Resources folders. If you are not sure how to do this, watch these videos. The first one shows you how to move items from your groups or classes to your Resources folders. The second one shows you how to create folders to keep your resources organized.
Even if you do not save stuff to Resources, you will have it available. All content will be archived and you will have full access to it. However, if you have it in Resources, it will be much more easily accessible.
As always, let me know if you need any help.