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What we’ve lost: The MySpace war files and the impact of a digital 'Dark Age'
(spectrumlocalnews.com)
This is a most excellent place for technology news and articles.
A huge solar storm could wipe out the backups too unless they're stored in a deep vault or something.
Solar storms arent really a risk for small electronics, more so if they aren't connected to the grid. You wouldn't need a deep vault, more like a cupboard.
There is a risk the hard drives wear out before society gets the grid back online and restarts producing hard drives though. We already don't have that many facilities and they would certainly be taken offline, and the knowledge to build those facilities, that might get lost properly when the storm would hit.
Would it effect optical media like CDs?
Time is more of a concern for CDs. They don't really last that long.