I started with current user base and average storage per user, then tried to layer in growth projections and attachment trends.
Break the problem into demand (how much storage users will consume) and supply (how much storage Google needs to provision), then estimate each component using available data and reasonable assumptions. Structure your answer by first outlining a framework, then walking through the calculations with clear assumptions, and finally discussing trade-offs and risks.
Pro tip: Anchor your estimate to a familiar metric like daily active users (DAU) and average storage per user, and explicitly state that you'd validate assumptions with real data from Google's internal dashboards before finalizing the purchase.
Confirm that the goal is to determine the total storage capacity to purchase for Gmail for the next year, considering growth, usage patterns, and redundancy. Ask clarifying questions about user base, growth rate, and existing storage infrastructure.
Calculate current storage usage by estimating the number of Gmail users, average storage per user (including emails, attachments, and metadata), and then project growth over the next year based on user growth and increasing attachment sizes.
Consider factors like data redundancy (replication), backup requirements, compression, and storage efficiency improvements. Also factor in storage already owned and the lead time for procurement.
Subtract existing available storage from the projected total demand to find the additional storage needed. Add a buffer for unexpected spikes or forecasting errors.
Discuss how you would validate assumptions with real data (e.g., historical growth rates, usage analytics) and adjust the estimate. Mention monitoring and adjusting the purchase plan as new data emerges.
AI-generated suggestions, not part of the candidate's original notes. May be inaccurate — verify before relying on them.