It works most of the time. I have also seen multiple in-place upgrades ending up in weird places. Or some resource having changed API and we had to rush to upgr

It works most of the time. I have also seen multiple in-place upgrades ending up in weird places. Or some resource having changed API and we had to rush to upgrade the code. What will you do if that happens? It's a bit like upgrading Postgres. It's a good idea to at least make a backup before changing the underlying storage.