I'm putting in a "Yea" vote for hosting the course search function here as a redundancy effort, if you have the resources. I wanted to check on record eligibility today for some July 4th races but the USATF hosted database is down this afternoon/evening.
http://www.usatf.org/events/courses/search/
Note that I attended many meetings in Dec at USATF Ann Meeting, specifically targeting website issues. My takeway based on decades in the industry is a Nov 2020 estimate for a reliable usatf.org infrastructure. So hosting a backup would not be a waste if you worry this may be "fixed" tomorrow and efforts wasted. Note that Justin reported original problems started in Sept 2017, which is 20 months ago, so no one should worry that this is a short-term issue not worth addressing!
Since the permanent usatf.org URLs to the maps seem to be pretty reliable, only a rough database is needed to generate a course certification number. That can be easily turned into the URL, which can point to usatf.org.
Also curious if anyone is monitoring the downtime of the course search database to use in negotiations with usatf.org. They'll simply say that the isolated several hour outage you are pointing out is the only time it was out in the last three months unless you have evidence to the contrary. Or say that it works now, so what's your problem?