Cannot rsync /proc/kcore to new disk

[Harry Putnam]

Trying to rsync an lubuntu `/' (OS-root) to a new disk

rsync stalls at /proc/kcore but does not quite/fail just sits
interminably showing /proc/kcore as the item its working on.

/proc/kcore shows zero `0' content with du -sb

ls -l shows a truly massive size:

ls -l kcore
-r-------- 1 root root 140737477881856 Dec 16 09:23 kcore

Attempts to move it with mv or cp -a also fail.

the `file' utility shows:

file kcore
kcore: ELF 64-bit LSB core file, x86-64, version 1 (SYSV), SVR4-style, from 'BOOT_IMAGE=/boot/vmlinuz-4.13.0-21-generic root=UUID=bf541840-b05d-45d9-974b-f3'

First, does this kcore really need to be copied over for the OS to
work at its new home.

If so, can I or should I do this with `dd'?