household · free Companion App · local in this browser

Device Backup Hours and Gaps

Turn an item list and a copy size into the unprotected count, the copy time, and the share covered.

Privacy: This App does not send or save your entries. Do not enter passwords, codes, full account numbers, or private identifiers.

Enter your numbers

Enter only the details needed for this task. Check them against the original source.

Drag to try another value

Now set to 0. The result, the chart, and the meter follow the slider as you drag. Typing a number in the form above moves the slider to match.

Your result will appear here.

Engine self-test

Running golden cases…

The bars are drawn from the numbers in your result and redraw on every compute. They show no new information and store nothing.

The chart is drawn from your result by this page's script. The text result above carries the same numbers.

U.S. Cybersecurity and Infrastructure Security Agency — Data Backup Options
Select a backup method that fits the information, recovery need, and storage risk. Keep backups separate from the original data.
Reviewed 2026-10-11. A backup label does not prove that the files can be restored. Test a safe copy and follow the device or service instructions.

This App counts and estimates from your numbers. It does not create a backup or prove a copy can be restored.

This free App has no paid features. It does not contact an agency, employer, bank, seller, provider, or other person.