According to the guide, incidents can be created in the past tense with the addition of a description of the case and the time it happened.
I was wondering:
1. If possible also list which components it affected (as you can choose to create an event on the spot).
2. Is it possible to choose a resolution of hours at the minute level and not just at the half hour level.
3. In addition, is it possible to create a past event with start time and end time.
While there isn't any functionality within the application to backfill component downtime while backfilling an incident, there is actually a way that you can backfill the data but it would actually be in a different process. The backfill incident tool itself is meant to point out incidents but those are not editable. Here is what you can do to accomplish the goal you are looking for. I have broken it into two separate sections since incidents and components need to be edited separately for this scenario.
If you happened to select a component when you created the incident, you will now see the related incident on the uptime tracker when you hover over that particular day.
I know this seems like a bit much but this is would be the best way to do this as the backfill tool can't get too detailed at this time.