Editing is easier when you can return to the recording you started with. Keep an untouched source copy before removing mistakes or trying a new processing chain. A useful timeline is not a replacement for the original audio.
Know where a change lives
Some edits change a project description: where a clip begins, how loud it plays or which region is muted. Other operations create or replace audio files. Read the current tool's behavior before assuming that every operation is reversible.
For a practical check, make a small test project with a copy of one recording. Trim a clip and save the project. Reopen the source file outside the project and confirm whether it still contains the full recording. This tells you more than a marketing label alone.
Keep the original in a clearly named source folder. Do not repeatedly export a compressed listening file and then use that export as the source for the next edit.
Save decision points
Before a major structure change, save a project version or use the editor's documented revision system. Give the version a meaningful label, such as before-second-answer-cut. A label explains the decision you may need to revisit.
Undo history is useful during a session, but it may not survive closing the tool or changing computers. Check how the application stores revisions rather than relying only on an active undo button.
At delivery, keep the project, its assets and the untouched recordings together in your archive plan. Test that the archive opens. The purpose is not to collect endless copies; it is to preserve a clear path from the recorded conversation to the published edit.