Add rate limiting for backup

**Feature request**
It would be great to have serialization for store.

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

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

The issue title requests rate limiting for backup, while the body requests store serialization and an `enable_serialization` option. No files, tests, or entry points are named; first clarify which feature is intended, then identify the relevant backup or store code and define completion criteria, including the option's default behavior.

Written by the indexing model from the issue text.