Only use --link-dest when backing up populated directories #138
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Rsync 3.0.0 and later appears to have some optimizations which results in...
... errors when using the
--link-destargument is used with empty directories. As there is nothing to hardlink to, we don't really need to use this argument so lets not use it.This resolves https://github.com/github/backup-utils/issues/137 (and is dependent on #136 being merged first).