Time Capsule external drive very slow for backup

I am experiencing very, very slow backup times using an external drive attached to my Time Capsule. When I recently added a 3 TB Rocstor external drive to my mid-2011 iMac using FireWire, I included it in the drives to be backed up. The internal 2 TB of storage in my Time Capsule was no longer enough, so I plugged a 4 TB WD My Book Studio drive into the Time Capsule's USB 2.0 port and specified this WD drive as the only backup storage. The first backup took almost 48 hours. Now the Time Machine keeps trying to back up about 400 GB - 500 GB (though there haven't been any changes) and is transferring about 400 KB/sec over Ethernet from my iMac to the Time Capsule's external drive. What am I doing wrong? (I recently upgraded the iMac to OS X 10.10.2 Yosemite.)

Frankly, I have no way to gauge your network setup, so I can't really tell you what you should expect. I can tell you from my own experiences using a local network based on a 3rd Gen. Gigabit Ethernet AEBS that using Ethernet the average throughput (not interface) was in the neighborhood of 16-20 MBs/sec. The average throughput for a USB 2.0 drive connected directly was about the same.
This works out to an average throughput of around 60 GBs/hour. Depending upon file sizes and number of files being transferred a USB 2.0 drive might reach 100 GBs/hour, but that is a rare outcome. The USB 2.0 drive interface speed is about the same as FireWire 400 - 400 Mb/s or roughly 50 MBs/sec. This is what I know from measurement. Do not expect Ethernet to be any faster for throughput.

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    -To sum up things: The setting "DHCP + NAT" delivers fast copying speeds
    Yes. You will eliminate the backroute to the fiber modem or maybe even back to your ISP - depending on their setup.
    The standard setting of the router is "DHCP + NAT" right?
    Normally the standard setting is good enough to obtain an internet connection instantly (without filling in IP, DNS etc. manually).
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  • Time Capsule/Airport is very slow...

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    Forgive the size of the post, but the suggestions below have helped others with similar issues. Try each topic individually and see if things improve, If not move on to the next one.
    *Keep the Time Capsule Cool*
    Some posters have observed that when they positioned the Time Capsule for better ventilation and cooling, their network connectivity issues resolved themselves. Also avoid locating the devise within poorly ventilated cabinets or piling items around or on top of it.
    *Time Capsule Orientation*
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    Select “Airport” in the toolbar.
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    Put a check mark in the box labeled “Use Wide Channels”. (If you are using a 802.11a/b/g (2.4GHz) radio mode then select “Interference Robustness”)
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    Click “Update” in the lower right hand corner.
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  • Can Time Capsule use another local network for backup?

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    1. Backups work sometimes and sometimes not although I am connected to my WPS secured network
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    edudrey wrote:
    When connected directly to the the internet cable the speed is over 2.5Mbs, but only 0.4Mbs through Time Machine 3T (802.11ac).
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