Proxmox Host Backup script

gistfile1.txt

#!/bin/bash
set -euo pipefail

# Configure where to store the backup and what to exclude, as it changes
# regularly and only contains ephemeral data.
if [ -f /etc/pve/local/pve-backup.env ] ; then
    source /etc/pve/local/pve-backup.env
else
    echo "File /etc/pve/local/pve-backup.env missing" > /dev/stderr
    exit 1
fi

# Exclude list
# Use a trailing '#' to keep directory structure/permissions but exclude file data inside it.
exclude=(
  '/bin'
  '/boot'
  '/dev'
  '/lib'
  '/lib64'
  '/local-zfs'
  '/lost+found'
  '/mnt'
  '/opt'
  '/proc'
  '/run'
  '/sbin'
  '/sys'
  '/tmp'
  '/usr'
  '/var/lib/lxcfs'
  '/dev/shm'
  '/var/cache'
  '/var/lib/rrdcached'
  '/var/tmp'
  '/var/lib/vz#'
  '/var/log#'
)

# Convert the list of exclusions into command line arguments for the PBS client.
# Treat entries with trailing '#' specially (keep dirs, drop contents).
exdirs=
for ex in "${exclude[@]}"; do
  base="${ex%#}"
  # exclude files/dirs within the path
  exdirs+=" --exclude ${base}/?*"
  # if it had '#', also exclude deeper contents but keep the directory skeleton
  if [ "$base" != "$ex" ]; then
    exdirs+=" --exclude ${base}/**/?* --exclude !${base}/**/"
  fi
done

# Take advantage of ZFS to create an atomic snapshot for backing up.
# We keep this snapshot around afterwards, as it is useful for quickly
# repairing accidentally damaged systems.
root="$(zfs list / | awk 'NR==2{ print $1 }')"
zfs destroy "${root}@backup" >&/dev/null || :
zfs snapshot "${root}@backup"
[ -d "/.zfs/snapshot/" ] || zfs set snapdir=visible "${root}"

# Backup our snapshot to the PBS server, excluding ephemeral/system data.
#set -f  # pathname expansion is already controlled; keep disabled unless needed
proxmox-backup-client backup "proxmox-root.pxar:/.zfs/snapshot/backup" \
  --change-detection-mode=metadata ${exdirs}