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Options to Install Leopard
Upgrade Mac OS X: This option keeps your older version of Mac OS X, but installs new versions of any files that have changed between the older version and Leopard. Although in theory this should be safe for everyone, third-party system add-ons, as well as damaged system files that aren't replaced, can cause problems.
Archive and Install: This method installs a complete, new version of Leopard, using none of your older OS installation files. It keeps all of your older system files on your hard drive-in a folder called Previous System. This method avoids many problems because the contents of your old System folder, including some third-party system add-ons, are archived in the Previous System folder.
Erase and Install: This method actually erases your entire hard drive-deleting all your data and installs Leopard. (Be sure you have a backup of your data to use this option.) This is useful if your current OS X installation has been having problems, as it guarantees that any disc or file corruption is eliminated. You'll need to either recreate your user accounts in Leopard and restore your data from a backup, or use OS X's Setup Assistant to transfer those accounts and data over from another computer or from a full backup. (Very similar to an Archive and Install with the Preserve Users and Network Settings option-but with the added bonus of a new, clean hard drive.)
Backup your data before installing. Verify your data after making backup. Recommended by users for backup: