In a former life (before clouds) we had a SAN go down because of a backplane problem. It was down for days while being diagnosed/fixed and then in read-only mo

In a former life (before clouds) we had a SAN go down because of a backplane problem. It was down for days while being diagnosed/fixed and then in read-only mode for another couple of days while the disks were in repair mode. I know people say things like "you should have a backup device" or "switches are cheap" but sometimes it IS the backup system that goes down and sometimes that system is VERY expensive.