How Long Can a Hard Drive Hold Data Without Power? - Lifehacker. Longevity of backups depends primarily on condition and handling.
I design a lot of disaster recovery systems and over the last few decades I've found that: Magnetic drives are fairly reliable when unplugged, but you'll still need to cycle them out over the years - My most common problem was the bearings and motors seizing causing drive failures. I've found that temperature is the primary deciding factory and potentially humidity another contributing factor. In datacenters that store the drives in hotter than room temp areas I've always had a higher drive failure rate from DR disks that are typically only plugged in once a month than the locations that have the same usage but store them in a cooler location.
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