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Acronis True Image Home 2011 - Slow Backup

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Within a few weeks, my full backup to an external hard drive went from taking 3 hours, to taking 6 hours, and now takes 20 hours to run. The size of the backup file has only increased from 57GB to 59GB, which certainly wouldn't justify that kind of difference.

I followed the flowchart for "Slow Backup Speed" and I've tried all priority and compression settings. Nothing is helping. What's going on?

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If backup size is essentially the same but time taken has doubled, I'd suspect your hardware.

Check the cable and the USB ports, perhaps try a different port and cable.
Run chkdsk /r on that drive.
Also run a drive checking utility from the drive manufacturer, as those sometimes catch errors missed by chkdsk.

Don't connect via a hub, a port in a monitor, a USB extension cord, etc. Connect the external drive directly to a USB port on the rear of the computer case. See if that works better.

Time might also increase if your disk is becoming full, although I don't know if time would double.