Add Kopia backup stack with Backblaze B2 offsite target.

Protects /config, selective labdata, and nightly DB dumps; documents homelab improvement plan briefs.

plans/homelab-improvements/tasks/TB-018-plane-evaluation.md

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+# TB-018 — Is Plane worth it?
+
+**Status:** not started  
+**Your call:** _(unset — talk first)_
+
+---
+
+## Talk first
+
+> **Stop.** Don't read Reference until we've talked.
+> In chat, say **"let's do TB-018"** or **"is plane worth it?"**.
+
+**In one sentence:** Plane is 7 containers for project management — do you use it?
+
+**Why it came up:** Gitea has issues; Homarr is your dashboard; Plane may be shelfware.
+
+### Questions
+
+1. When did you last open plane.ginnoir.com?
+2. Gitea issues enough, or need a kanban?
+
+### Your options
+
+| Option | Meaning |
+|--------|---------|
+| **Do it** | We're doing this — I'll implement or walk you through it |
+| **Later** | Keep on the list, not now |
+| **Drop** | Remove from plan — totally fine |
+| **Tweak** | Change scope; tell me how |
+
+### What we decided
+
+| | |
+|---|---|
+| **Decision** | |
+| **Notes** | |
+| **Date** | |
+
+---
+
+<details>
+<summary>Reference (only open if we're doing it)</summary>
+
+### Stack / files
+
+stacks/dev/
+
+### If we do it — rough steps
+
+1. Your usage answer
+2. Keep, or remove and reclaim resources
+
+### Done when
+
+- [ ] Decision recorded
+
+</details>