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this was a very unfortunate event where RAID was not a solution, it happens in 1% of the cases that a drive does not fail totally and the disks keep synchronizing the data even if its corrupted. The unfortunate part was that this did affect the boot partition of the disk; so the whole server crashed. Instead of maybe 1 site giving issues.
I occasionaly make backups of the site and database but not as often as I should. Fortunately, they were able to restore from their backups from a few days ago.