https://superuser.com/questions/1014071/how-to-protect-my-di...
Standard advice: the best thing you can do for protecting data is have an offsite backup. This could be as simple as Dropbox, Google Drive, Amazon S3, etc.
1. Cloud storage is likely to have a more resilient backup strategy;
2. Magnetic storms tend to be localized so you want to spread geographically. So if for example you copy data to hard drives and store them at home and work you're still in danger to a localized storm; and
3. And this is the big one. A single physical location exposes you to far more likely risks than solar storms such as fire, flooding and theft.
Offline backups would be safe (even from a close EMP, in HDD or SSD form).
1 - In theory you can have your power lines protected against those. But I wouldn't count on somebody's else lines being protected.
No.
If they're plugged in to the wall, they might get fried into a powdery crisp.
But they wouldn't get merely erased, and if they're not connected to a wall socket they'll be completely fine.