We forgot to upgrade a configuration after a database update on May 30, preventing the export scheduler to create new export tasks during the whole outage period. We completely resolved the issue on June 1 at 13:00 UTC and triggered again all the missing exports.

Since events related data were still correctly stored during the outage we experienced no data loss and those late exports are complete and correct.
However a userbase daily export contains a frozen view of your audience at the time of the export, view that we were not able to reproduce when resuming the export tasks.