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Synology DS218plus

Operational notes for accessing and navigating the Synology NAS without rediscovering paths.

Connection

SSH config alias: synology
Hostname/IP: 192.168.86.31
SSH user: jared
SSH key from ~/.ssh/config: ~/.ssh/id_ed25519_git
DSM web UI: https://192.168.86.31:5001 (HTTPS, self-signed cert) or http://192.168.86.31:5000 (HTTP); Home Assistant's Synology DSM integration connects on port 5001 with SSL verification disabled.
Verified NAS hostname: DS218plus

Quick check:

ssh synology 'hostname; id'

Expected identity:

DS218plus
uid=1026(jared) gid=100(users) groups=100(users),101(administrators),65536(family)

Volume Paths

SSH and SFTP use completely different namespaces. Do not mix them up.

SSH shell (ssh synology): home is /var/services/homes/jared (symlink to /volume1/homes/jared). Volume-level paths like /volume1/... are accessible.

SFTP / restic: shared folders appear directly under / as a virtual root. /volume1 does not exist in SFTP space.

# SFTP root listing
sftp synology <<'EOF'
ls /
EOF
# → archive  backup  home  homes  music  proxmox_backup

Active restic repo (SFTP path):

Purpose	SFTP path
Fedora restic repo	`/homes/jared/Backups/fedora-workstation`

Active restic repo (SSH path, for manual inspection):

Purpose	SSH path
Fedora restic repo	`~/Backups/fedora-workstation` = `/volume1/homes/jared/Backups/fedora-workstation`

Restic Access

Local restic is installed at /usr/bin/restic. Credentials are sourced from ~/.credentials; do not print the file or password.

The active backup script uses:

source ~/.credentials
restic -r "sftp:${SYNOLOGY_HOST}:${SYNOLOGY_PATH}" snapshots --compact

As of 2026-06-05, ~/.credentials has:

SYNOLOGY_HOST=synology
SYNOLOGY_PATH=/homes/jared/Backups/fedora-workstation

The leading path segment homes is the Synology shared folder name (visible in DSM), not a filesystem path. /volume1/homes/... is the SSH/filesystem equivalent but does not exist in SFTP space.

Repository structure:

config
data/
index/
keys/
locks/
snapshots/

Useful Restic Commands

List snapshots:

source ~/.credentials
restic -r "sftp:${SYNOLOGY_HOST}:${SYNOLOGY_PATH}" snapshots --compact

List a path in the latest snapshot:

source ~/.credentials
restic -r "sftp:${SYNOLOGY_HOST}:${SYNOLOGY_PATH}" ls latest /home/jared/.ssh

Search snapshots for specific files:

source ~/.credentials
restic -r "sftp:${SYNOLOGY_HOST}:${SYNOLOGY_PATH}" find /home/jared/.ssh/id_rsa /home/jared/.ssh/id_rsa.pub

Restore a specific file or directory to a temporary location:

source ~/.credentials
mkdir -p /tmp/restic-restore
restic -r "sftp:${SYNOLOGY_HOST}:${SYNOLOGY_PATH}" restore latest \
  --target /tmp/restic-restore \
  --include /home/jared/path/to/file

Snapshot State on 2026-06-05

The Fedora restic repo was stalled since 2026-05-24 due to wrong SFTP path in ~/.credentials (/home/... instead of /homes/...). Fixed 2026-06-05. Manual backup run confirmed new snapshot saved. Two stale locks were also cleared before the run.

Prior to fix, B2 had been running successfully every night; only Synology was affected.

SSH Key Recovery Findings

Checked while investigating Hyperthrive VPS access on 2026-05-14:

Latest restic snapshot .ssh contains only config, id_ed25519_git, id_ed25519_git.pub, id_ed25519_ovh_backup, id_ed25519_ovh_backup.pub, known_hosts, and known_hosts.old.
restic find did not find /home/jared/.ssh/id_rsa, /home/jared/.ssh/id_rsa.pub, id_ed25519_forgejo, or id_ed25519_forgejo.pub.
/volume1/backup/jared_backup052124/.ssh exists but is empty.
/volume1/backup/fedora_backup052124/jared/.ssh exists but is empty.
No .ssh files were found under /volume1/backup/fedora_backup052124 or /volume1/backup/fedora_recovery_oct2024 in the checked paths.

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