The easiest time to check whether you can leave a software tool is before you move important work into it.
Create a sample project with attachments, comments, dates and shared permissions. Export it and open the resulting files outside the service. Note which parts remain usable and which would need manual reconstruction. Check what happens to public links and who can authorise an export.
Store a short inventory of what needs regular backups. Choose an owner for the export process and rehearse restoring one sample project. For a team workspace, a list of files alone may leave behind the discussion and decisions that explain them.