How to apply this answer
Back up functions, not every item. Prioritise the speech, playback, display, power, stream or recording whose loss would stop the programme or remove a promised deliverable.
Event AV resource
A direct answer first, then the facts to collect and how to check it for your event.
You can start without a complete equipment list. The message is editable before you send it.
Direct answer
protect the function whose loss would stop the programme or remove a promised deliverable
Back up functions, not every item. Prioritise the speech, playback, display, power, stream or recording whose loss would stop the programme or remove a promised deliverable.
Trigger the failure during rehearsal, switch to the alternate path and confirm every destination. Measure the recovery time rather than assuming the spare is usable.
For a keynote presentation, the backup may be a second tested playback laptop connected to a spare switcher input, with the video operator authorised to change over after a named trigger.
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Add the date, venue, guest count and programme for Which AV outputs need a backup path?. You do not need to know the equipment names, and the message is editable before you send it.
Keep planning
Send the date, venue or area, guest count, programme and required outputs. You can start without a complete equipment list.
This guidance separates general advice from event-specific facts. Confirm venue conditions and your event details before finalising the requirement.