I was a user of Arq 3, but it was slow and seemed to eat up resources on my computer. I eventually turned it off, deleted the backups and deleted it. Not a great backup plan.

So I'm keen to know how much faster Arq 4 was, and in turn Arq 5. I'd be happy to try again (I think I'll have to pay full price again as I'm not an Arq 4 user) - but might wait until someone can let me know just how much faster it really is.

This whole thread has also reminded me to run my backups to local Time Machine!