Prepare root and boot floppies for the new installation.
Upgrading Your linux Distribution mini-HOWTO
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8. Prepare root and boot floppies for the new installation.

If you're lucky, your new package will include a bootable CD and this step won't be needed. If you haven't got a CDROM drive, or can't boot from it, details of how to make the floppies will be found in the installation guide for your new distribution.

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Make separate backups of each group of files you want to preserve. Format floppies for the temporary kernel and the final build.