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.
I installed my old 30gb into my new computer and copied a bunch of new files to it as a back up. Is there anything wrong with disconnecting the power and IDE cable from it and leaving it there until I need it again?
I have a similar setup using a removable ide rack. As long as the system is powered down, you can safely connect or disconnect the power / ide. In fact, for my rack backup, the ide remains connected, only the power gets turned on and off.... Works fine.