I have two computers (old and new) connecting by a cable, now I try to move/copy/clone a partition to the new computer, without copying files one by one. Then the new can access the files copied from the old easily, how to do for this question?
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The fastest way to clone partition is to attach old harddisk to the new machine and do the cloning. But (depend of files) copy files in most of the cases will be faster
It sounds like clonezilla would be the easiest way to go, if I understand your question correctly and the connection between the computers is working. Also, you could try mount the new partition/s then use rsync to copy everything. I used
rsync -avhPHAXx / /path/to/new/root
several times recently and it works every time. DO NOT FORGET TO (arch-)chroot into the new partition and install+update grub/your chosen bootloader, or you'll get an os not found type error.