scheduled duplicity backups with systemd

duplicity.service

# description:
# - once per day perform backup of $HOME
# - every 14th backup will be a full backup (~2 weeks)
# - delete all backups older than the 4th most recent full backup (~8 weeks)
# - exclude files larger than 100M

# usage:
# 1. install duplicity.service in ~/.config/systemd/user/
# 2. install duplicity.timer in ~/.config/systemd/user/
# 3. create ~/.duplicity and define DEST, GPG_KEY_ID, and PASSPHRASE
# 4. run 'systemctl --user enable duplicity.timer'
# 5. run 'systemctl --user start duplicity.timer'
# 6. if you get bus errors on debian try installing libpam-systemd via apt

[Unit]
Description=Duplicity backup and cleanup

[Service]
Type=oneshot
EnvironmentFile=%h/.duplicity
ExecStartPre=-/bin/sh -c '/usr/bin/find %h -size +100M > /tmp/filelist'
ExecStartPre=/bin/sed -e 's/^/"/g' -e 's/$/"/g' -i /tmp/filelist
ExecStart=/usr/bin/duplicity --name ${HOSTNAME} --encrypt-sign-key ${GPG_KEY_ID} --exclude-filelist /tmp/filelist --full-if-older-than 14D %h ${DEST}/${HOSTNAME}
ExecStart=/usr/bin/duplicity --name ${HOSTNAME} --encrypt-sign-key ${GPG_KEY_ID} remove-all-but-n-full 4 --force ${DEST}/${HOSTNAME}
ExecStart=/usr/bin/duplicity --name ${HOSTNAME} --encrypt-sign-key ${GPG_KEY_ID} cleanup --force ${DEST}/${HOSTNAME}
ExecStart=/usr/bin/duplicity --name ${HOSTNAME} --encrypt-sign-key ${GPG_KEY_ID} collection-status ${DEST}/${HOSTNAME}

duplicity.timer

# description:
# - once per day perform backup of $HOME
# - every 14th backup will be a full backup (~2 weeks)
# - delete all backups older than the 4th most recent full backup (~8 weeks)
# - exclude files larger than 100M

# usage:
# 1. install duplicity.service in ~/.config/systemd/user/
# 2. install duplicity.timer in ~/.config/systemd/user/
# 3. create ~/.duplicity and define DEST, GPG_KEY_ID, and PASSPHRASE
# 4. run 'systemctl --user enable duplicity.timer'
# 5. run 'systemctl --user start duplicity.timer'
# 6. if you get bus errors on debian try installing libpam-systemd via apt

[Unit]
Description=Duplicity daily timer

[Timer]
OnCalendar=daily
Persistent=true
Unit=duplicity.service

[Install]
WantedBy=default.target