Some users have recently had their accounts hijacked. It seems that the now defunct EVGA forums might have compromised your password there and seems many are using the same PW here. We would suggest you UPDATE YOUR PASSWORD and TURN ON 2FA for your account here to further secure it. None of the compromised accounts had 2FA turned on.
Once you have enabled 2FA, your account will be updated soon to show a badge, letting other members know that you use 2FA to protect your account. This should be beneficial for everyone that uses FSFT.
no, since redundancy just makes sure the files are are 2 separate drives. Its possible that you might get better performance when accessing multiple shares at once if they happened to be on separate drives but i doubt it
Need would be a little imprecise - you can always create an array with any set of drives, however capacity will be limited by the size of the smallest disk.