Unfortunately if you use Cognito for authentication you're currently SoL, as many of us learned the hard way last week.
Region rollover is not possible with Cognito. I believe you could backup the user pool to a different region, but users would still need to reset their passwords which would open another can of worms when you switch back to the original pool.
Region rollover is not possible with Cognito. I believe you could backup the user pool to a different region, but users would still need to reset their passwords which would open another can of worms when you switch back to the original pool.