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What speed do you need to back up 256 GB in 8 hours? 71.11 Mbps

By TechCompare · Updated · How we check

You need 71.11 Mbps at peak rate to copy 256 GB in eight hours. Gigabit Ethernet provides a large margin for a reliable overnight photo backup.

A 256 GB photo shoot needs 71.11 Mbps to copy within an eight-hour window at peak rate. That is a modest raw requirement, so almost any wired network and many modern wireless links can meet it. The harder part is making the overnight backup consistent when other traffic and drive behavior are included.

Required speed
71.1 Mbps
To move 256 GB
Deadline
8 hours
Maximum transfer window
Best fit
Gigabit Ethernet
1 Gbps peak link rate
Find the speed needed to move 256 GB in 8 hours. Change the scenario, deadline, or connection model.
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How this is calculated

The calculation uses 256 billion bytes, eight bits per byte, and 28,800 seconds. The result is 71.11 Mbps. A Gigabit Ethernet link is comfortably above that floor, while a busy WiFi connection can still miss it if the signal is weak or the link is shared. A wired backup also avoids the sleep, roaming, and interference events that make overnight jobs less predictable.

Verdict

Use a wired Gigabit link for the nightly backup. It could move the same 256 GB in about 34 minutes at peak. The spare time in an eight-hour window helps because photo backups contain many files, trigger filesystem work and compete with other traffic.

More Required speed scenarios

100 GB over USB 3.0
A 100 GB transfer over USB 3.0 works out to 2 minutes 40 seconds at the interface's 5 Gbps peak rate.
View details
1 TB over USB 3.0
A 1 TB transfer over USB 3.0 works out to 26 minutes 40 seconds at the interface's 5 Gbps peak data rate.
View details
4 GB over USB 2.0
A 4 GB transfer over USB 2.0 works out to 1 minute 6 seconds at the interface's 480 Mbps peak rate.
View details

Frequently asked questions

Is 100 Mbps enough to back up 256 GB overnight?
Yes at peak rate. The raw requirement for eight hours is 71.11 Mbps, but 100 Mbps leaves less room for overhead and other traffic than Gigabit Ethernet.
How long would 256 GB take over Gigabit Ethernet?
About 34 minutes 8 seconds at the 1000 Mbps peak link rate, before protocol and storage overhead.

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