#!/usr/bin/bash

# https://gist.github.com/bradfa/a710a4e4b83b07b7a8be77cae86ff56b
# https://gist.github.com/jasontbradshaw/6a69d7c9ae0c73f54200

# We name the repository directory after the system's hostname and the current
# year/month. We include the year/month combo so our backup repository doesn't
# continue to grow forever, and we can manually delete old ones as necessary.
# name="$(hostname)"
name="$(date -u +'%Y-%m-%d')"
# repository_dir="$(dirname "${1:-}/gets-removed")"
# repository="${repository_dir}/${name}/$(date -u +'%Y-%m')"
repository=/mnt/drive/bup/

# Set the `bup` directory here so it affects all the `bup` commands.
export BUP_DIR="${repository}"

# Create the backup repository if it doesn't exist.
if [ ! -d "${repository}" ]; then
  bup init
  chmod 700 "${repository}"
fi

# Do the backup as non-intrusively as possible.
echo "Indexing ${name}..."
nice -n19 ionice -c3 \
  bup index \
  --exclude='/var/tmp' \
  --exclude='/var/cache' \
  --exclude-rx='.*.qcow2' \
  --exclude-rx='.*.journal' \
  --exclude-rx='.*.wbfs' \
  --exclude-rx='.*.3ds' \
  --exclude-rx='.*.xci' \
  --exclude-rx='.*.nsp' \
  --exclude-rx='^/home/[^/]+/\.cache/.*' \
  --exclude-rx='^/home/[^/]+/\.local/share/Trash/.*' \
  --exclude-rx='^/home/[^/]+/\.local/share/containers/.*' \
  --exclude-rx='^/home/[^/]+/\.cemu/.*' \
  --exclude-rx='^/home/[^/]+/\.local/share/yuzu/.*' \
  '/home' '/etc' '/var' '/srv'

echo "Backing up ${name} to '${repository}'..."
nice -n19 ionice -c3 \
  bup save \
  --name="${name}" \
  --compress=9 \
  -vv \
  '/'