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

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

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)

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