Put files in directory structure

etc/restic/b2_env.sh

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+# B2 credentials.
+# Extracted settings so both systemd timers and user can just source this when want to work on my B2 backup.
+# See https://restic.readthedocs.io/en/latest/030_preparing_a_new_repo.html
+
+export RESTIC_REPOSITORY="b2:<b2-repo-name>"
+export RESTIC_PASSWORD_FILE="/etc/restic/b2_pw.txt"
+export B2_ACCOUNT_ID="<restic-account-id>"
+export B2_ACCOUNT_KEY="<restic-account-key>"

etc/restic/b2_pw.txt

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+<restic-password>

etc/systemd/system/restic-backup.service

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+[Unit]
+Description=Backup with restic to Backblaze B2
+OnFailure=status-email-user@%n.service
+
+[Service]
+Type=simple
+Nice=10
+ExecStart=/usr/local/sbin/restic_backup.sh
+# $HOME or $XDG_CACHE_HOME must be set for restic to find /root/.cache/restic/
+Environment="HOME=/root"

etc/systemd/system/restic-backup.timer

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+[Unit]
+Description=Backup with restic on schedule
+
+[Timer]
+OnCalendar=daily
+Persistent=true
+
+[Install]
+WantedBy=timers.target

etc/systemd/system/restic-check.service

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+[Unit]
+Description=Check restic backup Backblaze B2 for errors
+OnFailure=status-email-user@%n.service
+Conflicts=restic.service
+
+[Service]
+Type=simple
+Nice=10
+ExecStart=/usr/local/sbin/restic_check.sh

etc/systemd/system/restic-check.timer

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+[Unit]
+Description=Check restic backup Backblaze B2 for errors on a schedule
+
+[Timer]
+OnCalendar=monthly
+Persistent=true
+
+[Install]
+WantedBy=timers.target

etc/systemd/system/status-email-user@.service

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+# Source: https://serverfault.com/questions/876233/how-to-send-an-email-if-a-systemd-service-is-restarted
+# Source: https://wiki.archlinux.org/index.php/Systemd/Timers#MAILTO
+
+[Unit]
+Description=Send status email for %i to user
+
+[Service]
+Type=oneshot
+ExecStart=/usr/local/sbin/systemd-email abc@gmail.com %i
+User=root
+Group=systemd-journal