Multiplex backup is the key.
David Elliott's List: Tech Infrastructure
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Lets assume you buy into the idea that a new drive has a 50% chance of failure in 3 years.
the math on that is about the same as 50% chance of failure in 1000 days
or about the same risk as a 1 in 1000 chance taken every day for 1000 days.in otherwords every day your turn your pc there is a 1 in 1000 chance today is the day its going to die.
the same 1 in 1000 chance is also true for your backup.
you have a 1 in 1000 chance that when you turn to your backup to save your ass it will fail you.if you multiplex your backups onto two different devices such as a usb drive and a network drive.
then chance of both letting you down in the same day is the risk squared
or (1/1000) * (1/1000) = 1 in a million.
so simply multiplexing your backup doubles your storage but reduces your risk from 1/1000 to 1 in a million.
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