Handle edge cases in backup

**Feature request**
It would be great to have import for middleware.

**Use case**
Many users need this functionality for production deployments.

**Implementation idea**
Add a new config option `enable_import` with default `false`.

The title mentions backup edge cases, while the body requests middleware import and an `enable_import` configuration option. Start by locating the configuration handling and middleware import path; no files, tests, or entry points are named. Done means the option defaults to `false` and the requested import behavior works for the stated production use case.

Written by the indexing model from the issue text.