Clonezilla disk to image speed decreasing over time

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I am actually backing my whole 2tb disk using Clonezilla disk-to-image option.

I don't use any encryption or anything that I know that could slow down the process, and yet, Clonezilla tells me that there is 72 hours remaining at a speed of 400MB/min.

When I started it, Clonezilla told me that it would take 8 hours at 3gb/min but that speed just kept decreasing over time. Now one hour after the start of the copy, I am at 400mb/min and it keep decreasing. Is it normal ?

I am using Clonezilla on a bootable USB Key and the external hard drive receiving the copy image is new and healthy (using usb3 too). The only bad point I can think of is that the disk I am copying is usually a bit slow on my Windows (something is wrong with it, I don't know what) but still it shouldn't be THAT slow (and doesn't explain why it started at 3gb/min).

Is there anything I can do to speed up the process? Is it safe to reboot my computer during the copy and try again? Should I even bother trying again?

Edit:

Ok, 10 minutes after my question it is now at 84 hours. I just want to know if it is safe to shut it down because I am not going to wait the whole week for that.

Best Answer

i had the same issue , i was using Clonezilla from Parted.Magic 2017-06-12 to clone SSD->SSD sata3 , the speed was starting at 12GB/min but after 1min was droping to 5 and later to 1, after i boot it in 64bit mode (at parted magic select Default 64 instead of 32) the issue was gone, i got 9GB/min average at cloning 60GB.

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