Thanks for your answer and taking the time! Borgmatic search I did not know. That is an amazing tool. You are right about the mounting. My way of dealing with that is a NFS share I mount RW so I can restore to that and than copy whereever. This might it be ideal for very large restores though. Initially I thought I could borgmount to the NFS share and then access the filesystem via NFS. But this does nof work I suppose as Borg only lives inside the container. Generally I do like having Borg and Borgmatic containerized as almost everything else I selfhost but it adds complexity restoring. Anyways great project, it is just so powerful and in many ways elegant. Really enjoy using it!
This was the first idea. I cannot explain very well why this does not work. But I think the issue is that the borg mount magic lives inside the container so the filesystem cannot be seen from the host. You can mount an empty directory and copy the files you want to access from the host into it. Problem with that is that you are stuck with the tooling provided by the container.