Mark TB-001 backup stack complete.

Kopia+B2 deployed, cron scheduled, ntfy wired, restore tests passed.

plans/homelab-improvements/PLAN-BRIEF.md

@@ -18,7 +18,7 @@ Before any phase or task, we should answer:
 
 | | |
 |---|---|
-| **Priority theme** | Backups (TB-001 in progress) |
+| **Priority theme** | Backups done (TB-001 complete) |
 | **Explicitly dropped** | _(none yet)_ |
 | **Notes** | _(conversation notes go here)_ |
 
@@ -32,7 +32,7 @@ Each link opens an **interview-first** task brief. The conversation is the task.
 
 | Say this… | About |
 |-----------|--------|
-| [TB-001](tasks/TB-001-backup-stack.md) | Automated backups — you don't have any yet |
+| [TB-001](tasks/TB-001-backup-stack.md) | Automated backups — **done** (Kopia + B2) |
 | [TB-033](tasks/TB-033-public-surface-audit.md) | What's actually public on the internet? |
 | [TB-003](tasks/TB-003-recyclarr.md) | Sync *arr quality settings automatically |
 | [TB-004](tasks/TB-004-pin-infra-tags.md) | Stop `:latest` from breaking databases |