Apologies for not being more specific in what I'm comparing. You're right that their TB plan is 50x my 20GB plan, but I was referring to their 100GB plan.
Current plan: 20GB for $5/year ($0.41/mo) => $0.25/GB/year
New Plan 1: 100GB for $23.88/year => $0.24/GB/year
New Plan 2: 1TB for $119.88/year => $0.12/GB/year
The 100GB plan is not a better deal for me, especially if I'm unlikely to fill the 100GB. The 1TB plan could be a better deal but only for someone using more than 500GB.
Current plan: 20GB for $5/year ($0.41/mo) => $0.25/GB/year New Plan 1: 100GB for $23.88/year => $0.24/GB/year New Plan 2: 1TB for $119.88/year => $0.12/GB/year
The 100GB plan is not a better deal for me, especially if I'm unlikely to fill the 100GB. The 1TB plan could be a better deal but only for someone using more than 500GB.