File Retention Estimator

How to Use Retention Forecasts

This tool helps estimate steady-state storage when files arrive every day and remain available for a fixed retention window. It is useful for upload systems, audit logs, media workflows, and backup staging areas where the real question is not just how much data arrives, but how much remains on disk at the same time.

Planning Inputs That Matter

• Files per day: Your ongoing ingest volume, not a one-time migration.
• Average size: Use post-processing file size if compression or optimization happens after upload.
• Retention days: The maximum age before deletion or archival.
• Replica factor: Include mirrored copies or cross-zone duplication if they consume full storage.

Operational Notes

Add buffer above the estimate if uploads are bursty, if derivatives are generated later, or if retention deletes run in batches rather than continuously. For capacity reviews, compare this result against the backup storage result from the backup rotation planner rather than mixing both into one number.

Capacity Planning Use Cases

• Estimating storage for user uploads that age out after a policy window.
• Forecasting log, export, or report retention in internal operations systems.
• Sizing temporary processing buckets before files are archived elsewhere.
• Comparing the impact of changing retention from one policy window to another.

What the Estimate Does Not Include

The calculator does not model metadata overhead, object versioning, derived thumbnails, failed delete jobs, or storage-class transitions. Use it as a baseline for retained payload volume, then add your environment-specific overhead on top.

Decision-Making Guidance

If this estimate is close to your current limit, do not wait for exact production telemetry before acting. Reducing average file size, shortening retention, or lowering replica count each changes the curve in a different way, and this page gives you a quick way to compare those policy options.