pg_upgrade with --link then pg_basebackup for replication

Here is an odd question.

If one was to upgrade Postgres to 9.4 from 9.1 using the --link option,
then setup replication using pg_basebackup, would the standby server
preserve the hard links with the pg_basebackup or will -D
/new/destination/data/dir be a clean unlinked version?

Afterwards, if failing over to standby then failing back, would that
implement a non linked version back on the primary if specifying a new data
directory as well ?

--
Thanks,

Jorge Torralba
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