Very in expensive. No limit on amount you can backup (I've backed up over 230GB). Very unobtrusive.
I'm a backup nut. I also use Norton Ghost for daily backups stored on an external hard drive. But what if there's a fire or a burglary. Mozy gets all your important stuff out of your office/house. That's an extra level of security that Norton Ghost or Acronis don't provide.
Have they improved the upload speed?