This is the script I use to backup my macbook to a borgbackup repository. It should be a drop-in script and suit most users just fine, but I do recommend looking at the values and making them fit for your specific situation.

borgbackup.sh

#!/bin/bash

# Setting this, so the repo does not need to be given on the commandline:
export BORG_REPO='*******'

# Setting this, so you won't be asked for your repository passphrase:
export BORG_PASSPHRASE='*******'

# some helpers and error handling:
function info  () { echo -e "\n"`date` $@"\n" >&2; }
trap "echo `date` Backup interrupted >&2; exit 2" SIGINT SIGTERM

info "Starting backup"

# Backup the most important directories into an archive named after
# the machine this script is currently running on:

borg create                         \
    --verbose                       \
    --filter AME                    \
    --list                          \
    --stats                         \
    --show-rc                       \
    --compression lz4               \
    --exclude-caches                \
    --exclude '/Users/*/.cache/*'   \
    --exclude '/Users/*/.Trash/*'   \
    --exclude '/Users/*/Library/Caches' \
    --exclude '/Users/*/Library/Mobile Documents' \
    --exclude '/Users/*/Library/Containers/com.apple.mail/Data/Library/Mail Downloads' \
    --exclude '/Users/*/Music/iTunes/iTunes Media/Movies' \
    --exclude '/Users/*/Music/iTunes/iTunes Media/TV Shows' \
    --exclude '/Users/*/Dropbox' \
    --exclude '/Users/*/Google Drive' \
    --exclude '/Users/*/VirtualBox VMs' \
                                    \
    ::'{hostname}-{now}'            \
    /Users                          \
    /Library                        \
    /Applications                   \
    /usr/local                        # homebrew

backup_exit=$?

info "Pruning repository"

# Use the `prune` subcommand to maintain 24 hourly, 7 daily, 4 weekly and 6 monthly
# archives of THIS machine. The '{hostname}-' prefix is very important to
# limit prune's operation to this machine's archives and not apply to
# other machines' archives also:

borg prune                          \
    --list                          \
    --prefix '{hostname}-'          \
    --show-rc                       \
    --stats                         \
    --keep-hourly   24              \
    --keep-daily    7               \
    --keep-weekly   4               \
    --keep-monthly  6               \

prune_exit=$?

global_exit=$(( ${backup_exit} >  ${prune_exit} ? ${backup_exit} : ${prune_exit} ))

if [ ${global_exit} -eq 1 ];
then
    info "Backup and/or Prune finished with a warning"
fi

if [ ${global_exit} -gt 1 ];
then
    info "Backup and/or Prune finished with an error"
fi

exit ${global_exit}