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Document that rsync is an _optional_ way to upgrade standbys, suggest rsync option --dry-run, and mention a way of upgrading one standby from another using rsync. Also clarify some instructions by specifying if they operate on the old or new clusters. Reported-by: Stephen Frost, Magnus Hagander Discussion: https://postgr.es/m/20170914191250.GB6595@momjian.us Backpatch-through: 9.5