Configure both clients and servers

ansible/playbooks/roles/borg/templates/backup_script.sh.j2

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+#!/bin/bash
+{% for repo_item in borg_repos %}
+
+# Setting this, so the repo does not need to be given on the commandline:
+export BORG_REPO="{{borg_repo_base}}{{repo_item.name}}"
+
+# See the section "Passphrase notes" for more infos.
+export BORG_PASSPHRASE="'{{ repo_item.borg_passphrase }}'"
+
+# some helpers and error handling:
+info() { logger "$*"; }
+trap 'echo $( date ) Backup interrupted >&2; exit 2' INT TERM
+
+info "Trying to initialize repo. NB returns error if already initialized"
+borg init --encryption=repokey
+
+info "Starting backup for repo {{repo_item.name}}"
+
+# Backup the most important directories into an archive named after
+# the machine this script is currently running on:
+
+borg create                         \
+    --verbose                       \
+    --filter AME                    \
+    --list                          \
+    --stats                         \
+    --show-rc                       \
+    --compression lz4               \
+    --exclude-caches                \
+    --exclude 'home/*/.cache/*'     \
+    --exclude 'var/tmp/*'           \
+                                    \
+    ::"'{{ inventory_hostname }}-{now}'"\
+    {% for item in repo_item.paths_to_backup %}
+    {{ item }}\
+    {% endfor %}
+
+backup_exit=$?
+
+info "Pruning repository {{ repo_item.name }}"
+
+# Use the `prune` subcommand to maintain 7 daily, 4 weekly and 6 monthly
+# archives of THIS machine. The '{hostname}-*' matching is very important to
+# limit prune's operation to this machine's archives and not apply to
+# other machines' archives also:
+
+borg prune                          \
+    --list                          \
+    --glob-archives "'{{ inventory_hostname }}-*'"  \
+    --show-rc                       \
+    --keep-daily    7               \
+    --keep-weekly   4               \
+    --keep-monthly  6
+
+prune_exit=$?
+
+# actually free repo disk space by compacting segments
+
+info "Compacting repository {{ repo_item.name }}"
+
+borg compact
+
+compact_exit=$?
+
+# use highest exit code as global exit code
+global_exit=$(( backup_exit > prune_exit ? backup_exit : prune_exit ))
+global_exit=$(( compact_exit > global_exit ? compact_exit : global_exit ))
+
+if [ ${global_exit} -eq 0 ]; then
+    info "Backup, Prune, and Compact finished successfully"
+elif [ ${global_exit} -eq 1 ]; then
+    info "Backup, Prune, and/or Compact finished with warnings"
+else
+    info "Backup, Prune, and/or Compact finished with errors"
+fi
+
+
+# end loop for repos
+
+{% endfor %}
+
+
+exit ${global_exit}
+
+
+

ansible/playbooks/roles/borg/templates/borg_backup.service.j2

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+[Unit]
+Description=Borg Backup
+
+[Service]
+Type=oneshot
+User={{ borg_user }}
+ExecStart=/home/{{borg_user}}/backup_script.sh
+
+AmbientCapabilities=CAP_DAC_READ_SEARCH
+
+StandardOutput=journal
+StandardError=journal
+SyslogIdentifier=borg