Copy the plum.sqlite file to an external drive or cloud storage (OneDrive, Google Drive). If your PC crashes, reinstall Sticky Notes, close the app, then replace the new plum.sqlite with your backup.
On the old PC, copy plum.sqlite . On the new PC, install Sticky Notes, open it once (to create the folder), close it, then overwrite the file. Restart the app—your notes appear exactly as before. sticky notes windows 11 location