Automated Restic Backups with CPU+Memory throttling, inspired by: https://fedoramagazine.org/automate-backups-with-restic-and-systemd/

restic-backup.conf

B2_ACCOUNT_ID=XXXXXXXXXXXXXXXXXXXXXXXXX
B2_ACCOUNT_KEY=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX
RESTIC_REPOSITORY=b2:XXXXXXXXXXXXXXXXXX:/
RESTIC_PASSWORD=XXXXXXXXXXXXXXXXXXXXXXXXXXXXXXXX

BACKUP_PATHS="/home/naomi.nagata"
BACKUP_EXCLUDES="--exclude-file /home/rupert/.restic_excludes --exclude-if-present .exclude_from_backup"

RETENTION_DAYS=7
RETENTION_WEEKS=4
RETENTION_MONTHS=6
RETENTION_YEARS=3

restic.service

[Unit]
Description=Restic backup service

[Service]
Type=oneshot
Slice=restic.slice
ExecStart=/usr/bin/restic backup --verbose --one-file-system --tag systemd.timer $BACKUP_EXCLUDES $BACKUP_PATHS
EnvironmentFile=%h/.config/restic-backup.conf

# TODO: retention
# ExecStartPost=restic forget --verbose --tag systemd.timer --group-by "paths,tags" --keep-daily $RETENTION_DAYS --keep-weekly $RETENTION_WEEKS --keep-monthly $RETENTION_MONTHS --keep-yearly $RETENTION_YEARS

restic.slice

[Slice]
# 2 CPUs, adjust to preference
CPUQuota=200%
MemoryHigh=4G

restic.timer

[Unit]
Description=Backup with restic daily

[Timer]
OnCalendar=daily
Persistent=true

[Install]
WantedBy=timers.target

1. Put restic.{service,slice,timer} into ~/.config/systemd/user
2. Modify the config to fit your needs and place into ~/.config/restic-backup.conf
3. exec: systemctl --user daemon-reload
4. exec: systemctl --user enable restic.timer