Any serious site used for commercial purposes must be looked after and cared for, just like a physical storefront business. At a minimum...
  • Check here regularly for updates and secruity fixes
  • Actually install the new releases when they come out
  • Run backups on both the DB and store files as often as possible (I do one every night).
  • Maintain a backup history of at least 30 days, ensuring you can retrieve an old version should you get hacked and not be able to determine the intrusion date.