I made my own solution since I wasn't impressed by projects I had found. There's two parts, the backup image and the restore image.

I use it like so:

services:
  restore_sabnzbd:
    image: untouchedwagons/simple-restore:1.0.5
    container_name: restore_sabnzbd
    restart: no
    environment:
      - BACKUP_APPEND_DIRECTORY=/docker/production/sabnzbd
      - BACKUP_BASE_NAME=sabnzbd
      - FORCE_OWNERSHIP=1000:1000
    volumes:
      - sabnzbd:/data
      - /mnt/tank/Media/Backups:/backups

  sabnzbd:
    image: ghcr.io/onedr0p/sabnzbd:4
    container_name: sabnzbd
    restart: unless-stopped
    user: 1000:1000
    volumes:
      - sabnzbd:/config
      - /mnt/tank/Media/Usenet:/mnt/data/Usenet
    depends_on:
      restore_sabnzbd:
        condition: service_completed_successfully
    networks:
      - traefik_default

  backup_sabnzbd:
    image: untouchedwagons/simple-backup:1.1.0
    container_name: backup_sabnzbd
    restart: unless-stopped
    environment:
      TZ: "America/Toronto"
      BACKUP_APPEND_DIRECTORY: "/docker/production/sabnzbd"
      BACKUP_BASE_NAME: "sabnzbd"
      BACKUP_RETENTION: "24"
      BACKUP_FREQUENCY: "0 0 * * *"
    volumes:
      - sabnzbd:/data:ro
      - /mnt/tank/Media/Backups:/backups
      
networks:
  traefik_default:
    external: true

volumes:
  sabnzbd:

The restore container looks for a file called RESTORED in /data and if one isn't found it'll try to restore the latest backup (if available) and then create a RESTORED file. The backup container ignores this file during backup.