Backup Time Calculator

Estimate compressed backup size and transfer duration.

Enter the expected percentage reduction, not the remaining size.

About the Backup Time Calculator

Estimate backup duration from database capacity, expected compression reduction and sustained backup throughput.

How to use it

  1. Enter the database size and select MB, GB or TB.
  2. Enter sustained backup speed in MB/s.
  3. Optionally enter a compression reduction percentage and calculate.

Estimation formula

Backup size = source size × (1 - compression reduction / 100). Seconds = backup size in MB ÷ backup speed in MB/s.

Example

A 500 GB database reduced by 40% becomes an estimated 300 GB backup. At 200 MB/s, the ideal transfer time is about 25 minutes.

Estimate note

This is an estimate. Actual results depend on database engine, configuration, compression, indexes, workload, storage latency and network limits. Sizes use decimal base 1000.