Concorde is a 3 year old server and we never had RAID configured on servers at that time. all data from Concorde was getting mirrored using rsync on the secondary drive but something went wrong with crons which were set for backup or something else prevented mirroring on 26th.
We have configured daily database backup on all our servers last night but there seems nothing else that can be done to recover post 18th November backup.
We have other 3 old servers which don't have RAID configured and we will migrate them to new servers next week to avoid similar problem.
RAID is good in case of such drive failures but RAID has got some disadvantages as well. I don't think we should discuss those disadvantages right now as the priority right now is to sort database and email problems of those who suffered data loss due to HDD failure on Concorde.
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