Backup Window Calculator
Time to back up your data set.
Enter your values
ⓘ Live results
Results
- Full backup time
- 4 hours
- Incremental time
- 10 min
- Data transferred
- 1560 GB
- Fits overnight?
- Yes
Quick answer
Backup time is data volume divided by effective throughput, allowing for compression.
Hours = GB ÷ (MB/s × 3.6)
How to use the Backup Window Calculator
- 1Enter total data size.
- 2Enter realistic backup throughput.
- 3Set compression and daily change rate.
Worked example
Using the values the calculator loads with:
Inputs
- Data size2400 GB
- Throughput110 MB/s
- Compression35 %
- Daily change rate4 %
Results
- Full backup time4 hours
- Incremental time10 min
- Data transferred1560 GB
- Fits overnight?Yes
Frequently asked questions
Why is real throughput lower?
Small files and metadata overhead cut effective speed sharply.
What is a 3-2-1 backup?
Three copies, two media types, one offsite.
About this calculator
- Built and reviewed by James Whitfield · How we build and test calculators
- Report an error
Results are estimates for general information. For medical, legal, structural or financial decisions, confirm with a qualified professional.