Add rate limiting for encryption

**Description**
Currently controllers lacks proper backup support.

**Proposed solution**
Add configurable backup with sensible defaults.

**Priority**: Low/Medium

No files or tests are named. Start by locating the controller and the encryption or backup entry points, then clarify the conflict between the title's rate-limiting request and the body’s configurable-backup proposal. Done should mean an agreed scope, sensible defaults, and verified behavior through the repository’s existing checks.

Written by the indexing model from the issue text.