0k-charms/rsync-backup/metadata.yml

description: Rsync Backup Service
type: run-once

provides:
  backup:

uses:
  schedule-command:
    constraint: required
    auto: summon
    solves:
      missing-feature: "scheduling of backups"
    default-options:
      ## backup every day on random time
      schedule: !bash-stdout |
        printf "%d %s * * *" "$((RANDOM % 60))" "$((RANDOM % 6))-23/6"