Thanks for the suggestion, but don't you think we never thought to that before? I start to think you are considering us as 2 people in a garage. We are crunching numbers on a regular basis, and it never computes with those models. Proxmox is here since a long time, with a strong and "large" use base allowing to use this model. This is not the case for us now. So on short term, this is not doable. But be assured we are continuously working on testing various models to see what's the best fit.

When you click on the link of the error message it should send you to the official documentation, explaining what it means: https://xen-orchestra.com/docs/backup_troubleshooting.html#error-messages I'm not sure to understand the UI question, can you post a screenshot?

There's no "community" version of XOA, there's only Xen Orchestra Are you sure you are on master? Have you tried with XOA?