good question, and thanks for asking. :)
.loop files are just files in the ecosystem that are fully accessible via existing methods to third parties. Guest app access was recently enabled for SPE containers, so CRUD operations are now possible.
the tricky part is being able to create new Loop workspaces (SPE containers that the Loop app recognizes as "it's own"), which is not available yet. so, export is possible (which meets the needs of most scenarios), but creating new things from scratch that are fully recognized by Loop as "yup, that's exactly what I would have done if my code had created a new Loop workspace and put .loop files and shortcuts and .pod files in it" is the part that's not repeatable - this is what's necessary for restore.
M365 Backup and M365 Archive are on the backlog. once we get started on this, it will help us fill out the frame of everything we'll need to build in order for both us and anyone else to be able to do this properly. no timelines to share, probably a good time to ask again would be early CY2025.