How it works
Storage = (full size × retained fulls + daily changes × retained days) × stored-size percentage.
Input definitions
- Full backup size (GB)
- Enter the value in the labeled unit.
- Daily changed data (GB)
- Enter the value in the labeled unit.
- Full backups retained
- Enter the value in the labeled unit.
- Incremental days retained
- Enter the value in the labeled unit.
- Stored size after compression (%)
- Enter the value in the labeled unit.
A worked example
- Full backup size (GB)
- 500
- Daily changed data (GB)
- 20
- Full backups retained
- 4
- Incremental days retained
- 30
- Stored size after compression (%)
- 70
Assumptions & limits
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.
Sources & review
Maintained by AnsRio. Methods and examples use automated checks; this does not imply independent professional certification.
Method updated 2026-10-19. Content checked against the stated method and examples. Our verification approach.
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Common questions
Does this include deduplication across backups?
Only through the entered stored-size percentage. Metadata, replicas and provider minimums can add space.
How does Backup retention storage estimate calculate the result?
Storage = (full size × retained fulls + daily changes × retained days) × stored-size percentage.
What should I verify before using Backup retention storage estimate?
Uses only the values entered. Rates are illustrative inputs, not live quotes, legal rules or personalised advice. Check provider terms, local requirements and measurements before acting.