Chapter 38. Backing Up Files
What Is This "Backup" Thing?
Making copies of critical files in case the originals become inaccessible is called backing them up or making backups. Backups are insurance. They are time and effort you spend protecting yourself from things that might never happen. Your hard drive might never crash, but what vital things would you lose if it did?
Exactly what "making a backup" means varies depending on your circumstances. All of the following examples are ways to make backups applicable to some specific environment:
If you are just trying to protect your files on your personal machine, simply making sure that critical files have copies on multiple physical disks or occasionally copying files onto another machine or removable storage is probably sufficient. If you're administering a machine that has multiple users, regular backups are almost certainly a necessity. If those users are doing business-critical tasks, very regular backups and off-site copies are a requirement to protect the investment of time involved.
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