feat(tests): implement live VM acceptance test strategy (TODO-006 to TODO-010)

docs/todo/TODO-010.md

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+# PRD #2 - Task 5/5: Backup, restore, and update scenarios
+
+**Tags:** `task`, `prd-2`
+
+## Parent PRD
+
+PRD #2: Isolated live-system acceptance test strategy on Debian 12 VM (`docs/prd/PRD-002-live-vm-test-strategy.md`)
+
+## What to build
+
+Add backup/restore and update scenarios. Document the live test runbook: how to prepare the VM, set inventory, run scenarios, and read results. Ensure the whole live suite can be executed in one command.
+
+## Acceptance criteria
+
+- [ ] Backup scenario creates an archive with expected content.
+- [ ] Restore scenario returns config files to expected state.
+- [ ] Update scenario changes a component version/config observable on the VM.
+- [ ] Runbook `docs/live-testing.md` covers VM setup, inventory, execution, and troubleshooting.
+- [ ] Full `pytest -m live` run completes end-to-end.
+
+## Blocked by
+
+- TODO-009 (PRD #2 - Task 4/5: Mainsail and Fluidd install scenarios)
+
+## Next task
+
+None — this is the last task.
+
+## User stories addressed
+
+- User story 4
+- User story 7