When using --backup, the sequence (as monitored by strace) is:

rename("/path/to/", "/")
rename("/path/to/..xxxxxx", "/path/to/")

This, of course, leaves a momentary window wherein can't be found. Might
it be possible to replace the first rename() with link() instead? This, of
course, could only be done when the backup directory is on the same volume.

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