Prepare a short, verifiable summary
Before another review or a project restart, bring together the relevant agreement, latest version and open points. Separate what is confirmed, what is pending and what still needs checking. You can then ask your client a precise question without expecting them to reread every conversation.
For example, you find preview v02 followed by feedback requesting changes to two headings. You have prepared v03 to address those comments. The next step is to ask the client to review v03 while noting the two changes, rather than requesting fresh approval without identifying the material.
If a disagreement arises, stay with facts and references: the material presented, the response received and the issue to clarify. The record helps you prepare material for a conversation or a request for advice. It does not decide who is right or guarantee that an item will be accepted as evidence, a bank dispute will succeed or proceedings will have a particular outcome.
Retain what your activity needs
Organise your own backups and keep the documents required for your circumstances. Operational project history does not replace your retention obligations and should not be treated as a complete or unlimited archive of all your exchanges. Share only useful material, with access suited to the recipient.
For your next project, the benefit begins at the start: a clear agreement, identifiable versions and specific feedback. History then becomes useful day to day, helping you move forward and regain context, rather than a record you attempt to reconstruct only when something goes wrong.