**Reasoning:**
Policy documents are typically versioned chronologically, with the most recent effective date superseding earlier versions. The 2026-05 snippet is the latest dated policy and explicitly scopes its retention period to "production systems," making it both the most current and the most specific to the scenario. Assuming "today" falls on or after May 2026, this policy is active and overrides the earlier 2024-01 (14 days) and 2025-06 (30 days) rules.

**Final Answer:**
The 2026-05 policy applies, retaining backups for 45 days. This is because it is the most recent policy and explicitly targets production systems, superseding the earlier general retention rules.