---
created: 2026-05-20 09:30
modified: 2026-05-20 09:30
type: note
tags:
  - dev-ops
  - network
  - backup
  - system-config
  - localhost
aliases:
  - borg-backups
---
# [[Backup System — Borg, Kopia & Restic]]

## Overview

Three-machine backup with dual-copy (local + network) covering all critical data.

| Machine | Tool | Target | Schedule |
|---------|------|--------|----------|
| **.27** — sam-4screen-desktop | Borg (SSH) | `.13:/mnt/ubuntu_storage_3TB/backup/borg/.27` | Daily (after boot) |
| **.13** — nixos-desktop | Borg (local) | `/mnt/ubuntu_storage_3TB/backup/borg/.13` + rsync→.35/.23 | Daily 04:00 / 05:00 |
| **.35** — sam-ubuntu1 | Kopia + Backrest | `.23` NFS (`usb_3tb`) | Weekly Sun 22:00 |

---

## .27 — sam-4screen-desktop

**Source**: `/home/sam/` (excl: `.cache`, `.npm`, `node_modules`, `.venv`, `target`, `.cargo`, etc.)
**Target**: `sam@192.168.20.13:/mnt/ubuntu_storage_3TB/backup/borg/.27` via SSH (key: `~/.ssh/id_ed25519`)
**Schedule**: systemd timer — `OnCalendar=daily` (fires midnight, catches up after boot via Persistent)
**Prune**: 7 daily, 4 weekly, 3 monthly
**Passphrase**: `/home/sam/.borg-passphrase`
**Config**: `/etc/nixos/hosts/sam-4screen-desktop/backup.nix`
**Status**: `systemctl status borgbackup-job-home-to-13.service`
**Snapshots**: `borg list sam@192.168.20.13:/mnt/ubuntu_storage_3TB/backup/borg/.27`

## .13 — nixos-desktop

**Source**: Docker configs (`/home/sam/Docker/`), PocketBase (`/home/sam/pocketbase-data/`), dotfiles, `.ssh/`
**Primary**: `/mnt/ubuntu_storage_3TB/backup/borg/.13` (local ext4, 2.7T, 2.6T free)
**Secondary**: rsync → `sam@192.168.20.35:/mnt/nfs_usb_3tb/borg-repos/.13` → `.23` USB
**Schedule**: Borg daily 04:00 | rsync daily 05:00
**Prune**: 7 daily, 4 weekly, 3 monthly
**Passphrase**: `/home/sam/.borg-passphrase` (same as .27 recommended)
**Config**: `/etc/nixos/backup.nix`
**Snapshots**: `borg list /mnt/ubuntu_storage_3TB/backup/borg/.13`

> ⚠️ Borg runs as root — `postHook` chowns to `sam:users`. Known hosts issue: `/home/sam/.ssh/known_hosts` was a broken directory (fixed).

## .35 — sam-ubuntu1

**Tools**: Kopia + Backrest (Restic) — Docker containers
**Sources**: `/Docker/Containers/`, `/docker-config`, `/docker-volumes`, `/host_fs/root/trilium-data`
**Target**: `//192.168.20.23/usb_3tb` → `/mnt/nfs_usb_3tb/`
- Kopia repo: `/mnt/nfs_usb_3tb/kopia/backups/` (46G)
- Restic repo: `/mnt/nfs_usb_3tb/backups/restic/` (11G)
**Schedule**: 
- Kopia: Weekly Sun 22:00 (retention: 10 latest, 4 weekly, 12 monthly, 3 annual)
- Backrest: Weekly Sun 23:00 (prune/check daily)
**VM-level**: Proxmox Backup Server (.48)

## .23 — file-server

- 2.7T USB drive shared via CIFS/SMB to `.35`
- Backup repos consume ~57G, 2.5T free
- Also stores: `sam/` (personal docs/music/photos)

## Restore Commands

### .27 restore
```bash
export BORG_PASSPHRASE=$(cat /home/sam/.borg-passphrase)
borg extract sam@192.168.20.13:/mnt/ubuntu_storage_3TB/backup/borg/.27::<archive>
```

### .13 restore
```bash
export BORG_PASSPHRASE=$(cat /home/sam/.borg-passphrase)
borg extract /mnt/ubuntu_storage_3TB/backup/borg/.13::<archive>
```

## Not Covered

- `.27`: Git-tracked NixOS config (already covered by flakes)
- `.13`: Git-tracked NixOS config, `ollama`/`open-webui` Docker volumes, old Windows drives
- `.35`: Ubuntu VM filesystem (covered by Proxmox PBS), Obsidian vault (in Docker, covered by Kopia)