Hallo Simon,
ein mehrfaches Upgrade wird ebenfalls nicht empfohlen.
Hier ein Statement von Gordon Rowell:
Unmodified 5.6 boxes should upgrade fine to 7.1, but contribs and other tweaks may cause you pain. We did quite a bit of work in 7.0 development to make 5.6->7.0 upgrades work. However, we didn't do any testing of 5.6->7.1 as 5.X has been declared obsolete for some time.
That said, I would recommend a backup/restore rather than the double upgrade via 6.0 (which is also obsolete). It's a good time to clean out the cobwebs and remove any potentially incompatible contribs and other tweaks.
Es hat auch eine ganze Reihe von Anwendern gegeben, die bei Upgrade-Aktionen große Probleme bekommen hatten. Daher kann ich einfach nur empfehlen, so vorzugehen, wie bereits im früheren Posting beschrieben.
Gruß
Dietmar