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Data on your system can be classified into three broad types: program data, configuration data, and personal data. It s traditionally reasoned that backing up all types of data is inefficient, because it would mean backing up many gigabytes of information regularly. Because of this, you usually want to back up the latter two types of data: configuration and personal. The theory is that if your PC is hit by a harddisk-wrecking disaster, you can easily reinstall the OS from the CD or DVD. Restoring your system from backup is then simply a matter of ensuring that the configuration files are back in place, so your applications work as you would like them to, and your personal data is once again made accessible. Practically all the personal configuration data for programs you use every day, as well as your personal data, is stored in your /home directory (although the configuration files for software used systemwide are usually stored in the /etc directory).You might also want to consider locating your /home directory in a separate partition, for additional security. If you take a look in your /home directory, you might think that the previous sentence is incorrect. On a freshly installed system, the directory appears largely empty, apart from a handful of directories for music, photos, and so on. However, most, if not all, of the configuration files are hidden; their directory and filenames are preceded with a period (.), which means that Linux doesn t display them in a standard directory listing. To view hidden files and folders in the Nautilus file manager, choose View Show Hidden Files. This can be quite an eye-opener when you see the masses of data you didn t even realize were there, as shown in the example in Figure 23-1.

Command (m for help): m Command action a toggle a bootable flag b edit bsd disklabel c toggle the dos compatibility flag d delete a partition l list known partition types m print this menu n add a new partition o create a new empty DOS partition table p print the partition table q quit without saving changes s create a new empty Sun disklabel t change a partition's system id u change display/entry units v verify the partition table w write table to disk and exit x extra functionality (experts only) Command (m for help): 3. Press the p key to print the current partition table, which will provide an overview of the size of your disk in cylinders, the size of a cylinder, and all partitions that exist on that disk. Then fdisk asks again what you want to do. Press the n key on your keyboard to create a new partition. Listing 4-9. When Working with fdisk, Use the p Key Often So That You Can See the Current Partitioning. Command (m for help): p Disk /dev/sdb: 300.0 GB, 300090728448 bytes 255 heads, 63 sectors/track, 36483 cylinders Units = cylinders of 16065 * 512 = 8225280 bytes Device Boot Start End Blocks Id System

Listing 4-18. SQL Statement to Retrieve Members Who Have Entered a Tournament SELECT m.Lastname, m.FirstName FROM Member m WHERE EXISTS (SELECT * FROM Entry e WHERE e.MemberID = m.MemberID)

Figure 23-1. Most of the configuration files for programs are hidden literally in your /home directory. The configuration files held in your /home directory relate solely to your user account. Any other users will have their own configuration files, entirely independent of yours. In this way, all users can have their own configuration settings for various applications, which can be backed up independently. Under Ubuntu, you can back up both configuration data and personal files by using Simple Backup, which can be downloaded from the Ubuntu software repositories. Keep in mind that there s little point in making backups if you leave the resultant archive files on your hard disk. For full backup protection, the archives should be stored elsewhere, such as on an external hard disk, network mount, or CD/DVD-ROM. Consider using GNOME s CD/DVD Creator (click Applications Accessories CD/DVD Creator on the Main Menu).

4. After pressing n to create a new partition, fdisk will ask what kind of partition you want to create. On a hard disk you can create a maximum of four primary partitions. If you need more than four, you have to create one extended partition in which logical partitions can be created. In this example, I ll show you how to create an extended partition, so press the e key to start the interface that helps you create an extended partition. 5. The utility now asks what partition number you want to use. It will also show the numbers that are available.