Just FYI, I too would view Glacier support as something worth a normal upgrade fee. I am using Arq more as a long-term back-it-up-and-forget-about-it storage solution anyway, so it seems like a natural direction to go for a user like me (same strategy, but even lower cost).

That said, I am reminded that I should not forget about the Arq backups and do a few test restores sometime. :)