Use Plesk Backup Manager to back up your website, databases and mail, download backups and restore them when needed.
Create a reliable backup routine in Plesk: schedule backups, keep multiple restore points, and store copies off‑server using remote FTP storage.
If you need a quick backup (or Backup Manager is not available), you can back up your website manually: download the site files from httpdocs and export the database via phpMyAdmin. This guide explains the full process.