docs(home-lab): backup strategy page (needs retention SLA + offsite target decisions)

[JacobPEvans]

Goal

Create a Mintlify docs page covering the home lab backup strategy.

Why this needs user input

The page needs operational decisions Claude cannot make autonomously:

1. Retention SLA per data class — VM snapshots vs dataset snapshots vs config bundles. How long for each tier?
2. Offsite target — S3 Glacier? Backblaze B2? Different physical location? Synology offsite? Need a concrete answer (or a placeholder if it's still TBD).
3. Restore drill cadence — how often is a restore actually tested end-to-end, and where is the runbook?

Proposed page

• Path: infrastructure/backup-strategy.mdx
• Sidebar group: Infrastructure
• Tier: 2 (topical deep-dive)
• Key sources to read for content: ansible-proxmox (backup roles), terraform-proxmox (storage modules), about/homelab.mdx (current high-level mention)

Done definition

• Decisions captured above.
• Page authored and renders cleanly under mint dev.
• Linked from about/homelab.mdx and infrastructure/overview.mdx.