Size per item (bytes)

Growth Rate (r) [ using P_t = P₀e^rt ]

Storage cost ($/byte)

Bandwidth cost ($/byte)

Fraction of all stored items requested at peak (items/sec)

Ratio of average qps / peak qps

(for ephemeral only) Fraction of messages that are never delivered.

(for ephemeral only) Number of users to which the photo is sent.