some PC makers did not hide a back up system
some makes a hardware separation to make backup your system if you needed
Hidden partition.
A legitimate copy of Mac OS X 10.4 will only be available to buy.
Someone can find a NDMP backup from the Comm Vault website. Zmanda also offer backup services where backup software can be found for Linux, Mac OS and Windows computers.
Time Capsules
Use a ghost drive.
It's called "Time Machine". It's just basic back up software, it doesn't make a boot able copy of it. You have to use an external disk.
Because it did you idiot
most of the OS files are in use. so it's not possible to copy OS files while it is running. but instead you can use an application called norton ghost to copy the whole partition into an image on your HDD, and then copy the required file. another way is to turn off the PC, take the hdd and connect it to another PC as a second HDD (don't boot up from this HDD). after that you can copy all the OS files you need.
The best way to uninstall an OS is to format the drive used. Of-course you need to take backup of your important data from that drive.
It is always best to keep a back up copy of your hard disc in case something goes wrong. If you are wiping the hard disc to install a fresh copy of Snow Leopard then you will need a backup to restore all your stuff. If you perform an Archive and Install. when installing over an old version of Mac OS X, and select "Preserve Users and Network Settings" your stuff and the old operating system will be saved for you.
If you have a copy of Office for Windows then the Windows operating system will be required to run it. If you have a copy of Office for Macs then Mac OS X will be required to run it.
An OS CD is a disc that contains the Operating System and from which you can install a fresh copy of the OS onto your computer. A modern OS is likely to come on a DVD rather than a CD.