Documenting your project is critical. Documentation allows your funders or supporters to see the larger impact of your collaboration and its outcome. Photography*, progress reports, budgets, receipts, and final reports are often requested at the end of a project. If you collect and organize these things over an extended period of time, you will be more adequately prepared when documentation or reporting materials are asked of you.
*When photographing a project it is important to photograph the whole process, rather than just the end product. Be sure to get permission from your participants when photographing them.