How long does it take to backup 10 TB over 10GbE? RAID and NVMe write speeds

How this is calculated

Hitting the full 10 Gbps requires disks that can sustain ~1.2 GB/s on both ends, which is a real constraint. A single NVMe drive manages it, while a 4-drive RAID 5 of 7200 RPM disks typically maxes out around 600 MB/s sequential write, halving the effective transfer rate. Enterprise 25 GbE and 40 GbE Ethernet cut this to 53 and 33 minutes respectively, but cost an order of magnitude more and rarely make sense outside data centers.

Verdict

10 TB at 10 Gigabit Ethernet's 10 Gbps peak works out to 2 hours 13 minutes 20 seconds, the same figure as 1 TB over Gigabit because moving 10x the data at 10x the rate nets to the same time, and the math that defines what a 10 GbE home NAS upgrade actually buys you in practice. The real-world caveat is that the disk at both ends almost never sustains the 1.25 GB/s the 10 GbE link allows: SATA SSDs top out around 540 MB/s on a good day, spinning disks cap at 200-280 MB/s sequential, and ZFS or RAID rebuild traffic gets further dragged down by parity overhead. That's why the verdict's real-world planning number is 3-4 hours unless every hop in the data path (source, network, destination) is NVMe.