Even if you change the name of the other file, a Hardlink still points to the file.
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3
If you replace the other file with a new version(by copying it), a Hardlink will not point to the new file.
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4
A Hardlink can only work on the same filesystem,
it is simply a different name for the same inode(files are internally referenced by inodes).
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I might have confused myself a little but reading through various things,
I'm struggling to find the difference between a standard file and a Hardlink.