Hello Nick,
The diskettes will include the system recovery configuration files which will help you in creating partitions on the server during recovery. The diskettes also contain the necessary drivers as well as the system specific .dr file. The bootable media and the recover diskettes together contain all the files required to recover a Windows computer.
In case of the local computer, it is necessary to update the bootable media after every successful full backup. In case of remote computers, you do not need to create or update bootable media until a disaster occurs so long as a *.dr file for the remote computer is available on the media server.
Hope this answers your question. In case of doubts, do revert.
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Regards.