You can expect a warning.. unless their database gets overwritten and there are no backups! https://hardware.slashdot.org/story/09/01/02/1546214/why-mirroring-i

You can expect a warning.. unless their database gets overwritten and there are no backups! https://hardware.slashdot.org/story/09/01/02/1546214/why-mirroring-is-not-a-backup-solution https://hardware.slashdot.org/story/09/01/02/1546214/why-mir... (Granted, not an S&P500 company, but those have been known to fuck up as well)