Backing up
From The Glossary of Digital Photography
The process of making additional copies of images, or other data, in case one is accidentally destroyed or lost. Having one backup copy off-site helps to protect against a loss caused by a burglary, fire, or natural disaster. It is very important for photographers to back up all of their images. Digital images are actually very fragile and can be lost in a second. It is not a matter of if, but when, you will lose images. The files can be backed up on CDs, DVDs, another hard drive, or some combination of these media types. The backing-up process can be done manually or automatically. Having several backups is usually a good idea for peace of mind.
