Backing up your critical files is essential. It's best to protect yourself and clients from lost data because of equipment failure or some other emergency. A local backup solution might include an external hard drive connected by USB with a program like Allway Sync (http://allwaysync.com/) running to backup your files. This solution can be installed easily for around $100. Another option is to have an online backup system. Companies like Mozy (http://mozy.com/pro) and Iron Mountain (http://www.ironmountain.com/dataprotection/pc/backup.asp) provide competitive rates to backup your mission critical files.
Take some time today to evaluate your backup needs before a disaster happens and it's too late!