All drives fail eventually - ALL. Most of them fail within a couple of years with a significant percentage failing much more rapidly than that.
Given the low cost of drives, the excellent availability of good redundant solutions (raid, jbod, unraid), and the high cost of reripping/transcoding hundreds of movies, it makes no sense to not have some sort of backup. For smaller files, there are several good internet-based backup solutions (even emailing files to yourself via Gmail or similar).
I am using Unraid ( www.lime-technology.com ), software for the three drive version is free. If you want something less intensive, just buy an external drive and do a manual backup once in a while.
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