restic-backup.sh

# 1) define one or more Restic repo paths
typeset -A RESTIC_REPOS
RESTIC_REPOS[gdrive]=rclone:gdrive-backup:
RESTIC_REPOS[KX1T]=/media/kbingham/KX1T/backups
#RESTIC_REPOS[bigExternalDrive]=/media/kbingham/bigExternalDrive/backups

# 2) create an exclude file with lines like:
#  **/*cache/
#  **/cache*/
#  **/*Cache/
#  **/CachedData/
#  **/.Trash*/
#  /home/kbingham/.local/share/Trash/
#  /home/kbingham/.local/share/flatpak/
RESTIC_EXCLUDE=$HOME/etc/kbingham-backup.exclude

# 3) save the Restic repo passphrase in this file 
#export RESTIC_PASSWORD="my restic passphrase"
#         or provide a shell command that will yield the passphrase
RESTIC_PASSWORD_CMD="source <(gpg -qd < ~/Private/idrepo/etc/restic-passphrase.gpg)"

# 4) adjust the retention policy if desired
RESTIC_FORGET="\
  --keep-tag keepers \
  --host $(hostname -s) \
  --keep-hourly 12 \
  --keep-daily 14 \
  --keep-weekly 6 \
  --keep-monthly 12 \
  --keep-yearly 5
"

function backup(){
  [[ $# -ge 1 ]] && {
    typeset -a REPOS=($@)
  } || {
  # zsh
  #  typeset -a REPOS=(${(k)RESTIC_REPOS[@]})
  # bash
    typeset -a REPOS=(${!RESTIC_REPOS[@]})
  }
  [[ ! -z ${RESTIC_PASSWORD+true} ]] || eval "$RESTIC_PASSWORD_CMD";
  for REPO in ${REPOS[@]}; do
    echo -e "\nBEGIN $REPO"
    [[ -d ${RESTIC_REPOS[$REPO]} ]] || {
      restic --repo=${RESTIC_REPOS[$REPO]} init
    }
    eval restic  --repo=${RESTIC_REPOS[$REPO]} backup $HOME \
        --exclude-file=$RESTIC_EXCLUDE --verbose
    eval restic  --repo=${RESTIC_REPOS[$REPO]} --cleanup-cache forget $RESTIC_FORGET
    echo -e "END $REPO\n"
  done
}

# 5) add a line to your ~/.bashrc file like:
#  source ~/.restic.conf

# 6) save this file as ~/.restic.conf

# 7) run "backup" in terminal