Hi Matrix,
welcome to Enhance! I had the exact same questions when I started — in my case I didn’t even say hello, I just jumped in and started exploring. And honestly, I’m glad I did.
Yes, you can have multiple backup servers and multiple email servers, and you can choose which one each site uses. In my setup I currently have one dedicated email server and two backup servers, with clients split between them. Backups go to only one destination per site for now, but there’s documentation here on the forum explaining how to duplicate backups to a second location. From what I’ve seen, the data is sent directly without using temporary space on the web server.
About quotas: yes, when you use a separate email server, the quota calculation still doesn’t include email usage. We’re all hoping this will be fixed soon.
Regarding XFS vs EXT4, I can’t help much there — I use only EXT4 across my whole infrastructure and never had issues.
As for common mistakes, Enhance is simple and straightforward. Of course curiosity sometimes leads to small slip-ups, but nothing serious. For your idea of migrating a large Plesk server into multiple individual VPS instances with isolated roles, Enhance fits perfectly — it was practically built for that type of architecture.
About HTTP/3: in Enhance, Apache and Nginx are separate roles — they’re not combined like in Plesk. HTTP/3 is currently only available on OpenLiteSpeed and LiteSpeed Enterprise. If you use OLS with Cloudflare, remember to disable TLS 1.3 on Cloudflare or HTTP/3 won’t work properly.
Enjoy Enhance. I was a big cPanel defender for years, and now I don’t regret switching at all. If you need anything else, I’m around.