The following is a great article that reviews 27 Online Backup Services. There are no excuses for NOT backing up your local backups and other important documents/files.
Online backup services work much like traditional backup software. With an online backup service, however, your important data is transmitted over the Internet and securely stored on a server in a professional data center. The advantage of having your important data backed up off-site, away from your home or office, is that it’s safe from theft, fire, and other local disasters.
You might also want to check out this great article that covers Common Questions about Online Backups.