How do I purchase a Time Capsule?

A Time Capsule is a one-time purchase ($79), not a subscription. It includes 2GB of storage that can also be used by your other vaults, does not expire, and does not require an existing paid plan.

Buy it from Settings → Account or Settings → Addons. After purchase you can create Time Capsule vaults that unlock on a specific future date and time you choose.

Release dates are stored in UTC. Set your timezone in Settings → Profile so the picker matches your local time. See also how daylight savings affects vault unlocks.