If you need to back up or restore your TiVo software, you are going to need to use MFS Tools.
MFS Tools is the TiVo backup and restore program. You should get familiar with using it so you can use it in a pinch, but pray that you never have to use it, except the one time that you want to upgrade the hard drives in your TiVo. To begin, you'll need to get your TiVo's hard drive installed in a PC [Hack #22].
Without some modification, your PC may not boot from the CD or the boot floppy. If you are using the boot CD, you will want to set your BIOS to boot from the CD. Likewise with the floppy: make sure that the BIOS tells the computer to boot from the floppy. Most BIOS configuration menus are reached by hitting the Delete key on your keyboard just as the first signs of life flicker across your computer's screen when booting up. Consult your BIOS manual (usually in the box with a new PC or available online from the PC vendor) for instructions on setting your PC to boot from CD or floppy rather than the primary master hard drive (drive C to you Windows users).
While the version of the Linux operating system that runs from the MFS Tools CD or boot floppy will recognize the full capacity of the larger drives, some earlier versions of the BIOS will not recognize hard drives above a certain size. You may have to adjust your BIOS settings so that the drive recognition parameter for your TiVo drive or drives is set ...