The KB article linked to below explains how to add IFL to your Linux distribution's Grub boot menu. It also covers how to automate or semi-automate IFL backup and restore operations initiated by booting into IFL from your running Linux distribution, and then booting back into the Linux distribution afterwards (if desired). One of its advantages is that it does not require any repartitioning to set up. Another advantage is that it does not require any handling of IFL boot media.
The method described in this KB article is available in IFL versions 2.83 and later. It supports Grub2 as well as Grub Legacy, automates most of the setup with an updated, menu-driven 'makeGRUB' script, and provides improved flexibility in configuring user scripts and cron jobs.
For those who have been using the older whitepaper linked to below, that method can still be used on distributions using Grub Legacy. While that method will still work, you may want to consider trying the method covered in the KB article above at some point, since the procedure to get things set up is much easier and more automated.
The whitepaper is available for download here: ifl_linux_auto.zip