‘jetpack_sync_cron’ has failed to run?

I’ve setup a new website. The only thing I’ve really done so far is install and configure some plugins, namely UpdraftPlus (a website backup plugin).

I return a week later and notice the following error message under Health Check:

“A scheduled event (jetpack_sync_cron) has failed to run. Your site still works, but this may indicate that scheduling posts or automated updates may not work as intended.”

I don’t know what to do about this. It’s a new site, I shouldn’t have any problems.

Seems to be messing with UpdraftPlus too. I can’t seem to link my Dropbox anymore, I get a HTTP 500 error when I try.