Guide

How much space do I need for backups.

The most common way to run short is not misreading today's size, but ignoring growth over the next months and skipping a safety margin.

What this guide solves

This guide helps you ground a purchase or backup plan without reducing the question to "how much do my files weigh today?" The practical criterion is current size plus expected growth plus enough room to recover without operating at the edge.

How to read the recommendation

Add the current size of your important files, include a safety margin and think about how much they may grow over 12 months. That number is usually more useful than buying "the minimum."

What you should back up

• Irreplaceable photos and videos.
• Work documents.
• Home or business files you do not want to lose.
• Exports or final project files.

Key assumptions

• Your library will keep growing over the next months.
• A useful backup needs room for versions, changes and restoration.
• 4K video, RAW and long media libraries grow much faster than light document sets.

Limits of this page

• It does not replace measuring the real weight of your current folders or services.
• It does not define a full 3-2-1 strategy or an enterprise continuity policy on its own.
• It uses practical editorial judgment, not a universal promise of exact capacity.

Official sources

The idea of treating backup as recovery capacity, testing restores and planning for continuity is grounded in official guidance from CISA and NIST.

• CISA: Data Backup Options
• CISA: Back Up Government Data
• NIST: Protecting Data from Ransomware and Other Data Loss Events

Next step

If you want a more grounded buying reference, use the storage calculator and then compare it against the backup growth calculator.