Training modules/Dealing with online harassment/slides/where-should-the-documentation-be-stored

Investigating reports: Where should the documentation be stored?
The answer to this question depends on your role. Some groups, such as Arbitration Committees, may have their own "private" wiki. Other groups may primarily use email in their communications. Individuals receiving reports may have no designated place to document. So, work either in your team's designated space or in a secure document of your own creation to store the information.

Do not use an on-wiki "sandbox" for this, and avoid hosting your documents in publicly accessible places, such as an unsecured "cloud" storage account. Collaborative documents such as Google Docs can be useful; however, you should pay careful attention to the "sharing" or security settings (see Google's help page on this topic). Your documents may well contain personally identifying information, and a "leak" could permanently damage the reputation and public trust that users have in your group.