Friends, I am hear to bear witness! Once I lived in darkness and sin, and I have suffered the pain of my transgressions.
I kept one copy--yes friends--one copy only-- of data I believed was important.
One fateful day Providence saw fit to show me the error of my ways. The foundation of rust on which my data was build collapsed into the sea of oblivion and the data thereon was lost forever to the void. Yes, Lost! Lost and without hope of salvation!
But this was a blessing, Friends, a blessing and a revelation for it was at that moment of humiliation and regret that the truth was shown to this poor sinner!
(cue rising electric organ chord)
That data is gone and despite our mournful remembrance of our departed files, they can never be brought back from their eternal sleep.
But, friends, that data was not important. For verily it is written that none may know the hour that the data will be lost, only that the data will be lost. And it is also written that data of which there is only one copy is not important data.
Brethren (and Sistren...) do not repeat my error and sin! Learn from my sin and my shame and join me in salvation!
Use ye a robust and mature filesystem with many protective features as self-checking, and multiple parity.
Yea, I say unto you multiple parity. Spend ye a small sum today for truly I say to ye that if ye are afraid to purchase an additional drive, then surely professional data recovery is beyond your means! Trust not in single parity for it is written that filesystems have grow huge in our greed for virtual machines, high resolution, and hoarding. Yea, though RAID5 was once a stalwart guardian against the failure of a single drive, RAID5 is dead and its promises are vanity for surely on the day the first drive fails thou shalt begin to rebuild thy array and before thou canst complete thy task the second drive shall fail and on that day there will be no salvation but only the wailing and gnashing of teeth.
Scrub ye regularly thy filesystem and furthermore perform regular smart long tests, but never at the same time, for it is written that a scrub and a long test shall persist unto eternity and never complete.
Implement well thy automated email notices and read thoroughly thy notices every week. When thy status report does not arrive at the appointed hour and when thy daemon sends thee an unexpected email, remain not idle but take action to investigate and resolve thy anomalies.
When thee hast constructed and filled a robust and well-monitored filesystem name it thy primary file server and do not rest in false security, but instead do the same a second time call this thy secondary file server. Locate ye thy secondary server in a place separate and apart from thy primary server and schedule ye regular backups from the primary to the backup filesystem. Monitor ye well the status of the backups and should the report of successful replication fail to arrive at the appointed time, investigate thy primary and secondary servers and all the links between. For in truth it is written that RAID is not a backup.
Go forth in peace my brothers and sisters in the knowledge that while it is inevitable that thy data will still someday be lost, this day will come to pass after all else has been lost and on this day the data will truly not be important.