Keeping saves, backups and PDFs apart
The editable original and the file you submit serve different purposes. Keep both.
Understand what account storage covers
Once you sign in, your resumes save to your account automatically, and you can continue on another device by signing in with the same ID. Account storage protects the editable original; make the file you submit separately as a PDF. Keep backup files of important resumes too, in case you delete your account or remove one by mistake.
Backup files are for editing again later
Download a backup from My resumes and keep it somewhere safe. A backup is a plain-text .resume.json file that contains the personal information you entered. Do not upload it to shared folders or public repositories. Importing always creates a copy and does not overwrite existing documents.
Check the actual PDF file before submitting
Check your name, contact details, dates, links and every page. Make sure the text can still be searched and copied, and look at line breaks and page edges. The PDF is generated on the server; the browser print fallback can give different results depending on browser settings.
Practice recovering in advance
Practicing with a sample document, downloading a backup and importing it as a new document, will help if a real problem occurs. If an import fails, keep the original file, and do not edit or delete existing files until the error is resolved.