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Infrastructure & Storage

Backup Window Calculator

Estimate the transfer time needed to complete a backup.

Calculations run in your browser. The tool does not send your inputs to a server.

01Your inputs

Local workspace

Start with the sample below, or enter your own values.

Enter a numeric value using the unit shown in the label.
Enter a numeric value using the unit shown in the label.
Enter a percentage as a number, such as 85 for 85%.

02Your result

Your result will appear here. Choose an action after checking your inputs.

A quick guide

How to use this tool

  1. Check the example and the unit beside each input.
  2. Enter your values and choose Calculate.
  3. Review the result and assumptions, then copy what you need.

Reset example restores the starting values. Clear removes text and number inputs, returns choices to their first valid option, and removes the result.

Reference guide

Explanation and worked examples

Throughput here is MB/s, whereas network link speeds are often Mbps. Include scan time, contention and restore testing in your operational plan.

Use in day-to-day IT work

Check whether a backup transfer can fit into its scheduled window.

Checks before applying the result

  • 1,000 decimal GB at 100 MB/s and 80% utilisation takes 12,500 seconds, about 3 hours 28 minutes.
  • Add discovery, snapshots, consistency checks and verification time. Test restore duration separately.
New to the terminology?
IOPS
Input/output operations completed each second.
GiB vs GB
GiB uses powers of 1,024; GB uses powers of 1,000.
Overcommit
Allocating more virtual resources than physically available.

Keep exploring

RAID CalculatorStorage Unit ConverterIOPS CalculatorIOPS to Throughput Calculator

How calculations work and where the models stop →