What is iCloud?
How much is the 2TB option?
How do you get 2TB of iCloud space?
On your iOS device, go to Settings > iCloud > Storage. Tap Buy More Storage or Change Storage Plan. Select a plan, then tap Buy, and enter your Apple ID password.
On your Mac, select Apple menu > System Preferences, then click iCloud. Click Manage in the lower-right corner. Click Buy More Storage or Change Storage Plan. Select a plan, then click Next, and enter your Apple ID password.