1) Where is off-site? Am I going to ask a family member to hold onto a drive? Do i trust them to keep it safe, away from magnets, dry, etc... Do I trust they will find it when I need it? What if I need it at 3AM?Why not buy a physical hard drive to store off site?
$60 for a TB and it's yours forever.......
2) Physical hard drives are NOT forever. If I let a drive sit 2 years I have about as much confidence in it starting as a car I left sitting for 2 years.
An online backup is ten times safer than a physical drive.
I bit the bullet with iDrive today and paid for a subscription. It's uploading much faster than Carbonite. I've left carbonite uploading anyway, we'll see which finishes first.