Photographer

Data transfer for photographers: how long to back up a 256 GB shoot

Last updated 2026-06-24

Budget at least the 6m 49s USB 3.0 peak-link floor for 256 GB. If you shoot regularly, get a Thunderbolt 4 NVMe enclosure to raise the link-rate ceiling and shorten the backup window.

Estimated Transfer Time

6m 49s

about 1.28 million pages of PDFs

A 256 GB copy over USB 3.0, pre-loaded. Swap the link to Thunderbolt 4 NVMe or Gigabit Ethernet and watch the clock.

Edit in the full tool

Photographers backing up a 256 GB shoot can start with the peak link calculation. USB 3.0 works out to about 6 minutes 49 seconds, Gigabit Ethernet to about 34 minutes 8 seconds, and WiFi 6 to about 3 minutes 33 seconds at the nominal peak rates. Real storage and wireless overhead can only make those times longer.

Why this matters for you

The peak-link math is a floor, not a promise of application throughput. USB 3.0 is rated 5 Gbps, Gigabit Ethernet 1 Gbps, and WiFi 6 has a higher nominal peak, but the destination drive, protocol overhead, signal quality, and TCP behavior can all slow a copy. For wedding photographers with 500 GB+ shoots, a fast Thunderbolt 4 NVMe enclosure gives the highest link-rate ceiling.

Your card reader is often the real limit

The link to your computer is only one part of the copy. A UHS-I SD card bus tops out at 104 MB/s, so 256 GB takes at least 41 minutes no matter how fast the cable is. UHS-II raises the bus to 312 MB/s, about 13 minutes 40 seconds for the same shoot. CFexpress Type B cards use a PCIe link with a ceiling of about 2,000 MB/s, around 2 minutes 8 seconds.

Cards usually read slower than their bus, and you need a reader that matches the card. Treat these numbers as best cases, just like the link rates above.

Plan the offsite copy

A solid backup keeps three copies on two kinds of storage, with one offsite. Uploading is usually the slow part. At 50 Mbps of upload speed, 256 GB takes about 11 hours 23 minutes. At 20 Mbps it's over 28 hours. Start cloud uploads overnight, or take a second drive offsite if your upload is slow.

Why your computer shows less than 256 GB

Card makers count 1 GB as 10⁹ bytes. Windows shows sizes in binary units, so a full 256 GB card appears as about 238 GB there. The data is the same. The calculator uses decimal units, like the card label.

Verdict

Treat 6m 49s per 256 GB over USB 3.0 as a floor, because the card and drive set the real pace. A Thunderbolt 4 NVMe enclosure pays off if you shoot often.

Open the Data Transfer Calculator

Frequently asked questions

Why is my copy slower than the calculator says?

The calculator uses the link's peak rate. The card, the reader, the destination drive and lots of small files can all slow a real copy. Thousands of RAW files add per file overhead that one large file doesn't have.

How long does it take to upload a 256 GB shoot to the cloud?

About 5 hours 41 minutes at 100 Mbps upload, 11 hours 23 minutes at 50 Mbps, and over 28 hours at 20 Mbps, before any overhead. Upload speed is often much lower than download speed, so check yours first.

Is a UHS-II card worth it for backups?

If you shoot large sessions, yes. A UHS-II card in a UHS-II reader can copy 256 GB in under 14 minutes at its bus limit, against at least 41 minutes on UHS-I. You need both the card and the reader to get that speed.