I'm curious as to why you took that approach. Why not just straight to B2 from each machine? Is it for a redundant local copy of all the backups? If so that sounds like a good idea since restoring from B2 takes ages just because listing the revisions is hella slow for me...
I like the one-repository approach as it works well - it resides on my NAS which is always on and it is a local backup for multiple machines. From there, I replicate to B2 as an emergency copy in the event my NAS (RAID is not backup!) dies or something horrific. I tried to make it future-proof as much as possible too - with Duplicacy, you can easily clone/copy repositories so new hardware migration will be extremely simple. Not only simple with local hardware, but easy to migrate to a different cloud storage as well. Just don't lose your repository encryption key!
