---
- name: Ubuntu Data Backup Automation by Ansible
  hosts: source_servers
  become: yes
  vars:
    source_dir: "/path/to/source"  # Change to the actual folder to back up
    dest_dir: "/path/to/destination"  # Change to the actual backup location on DESTINATION server
    destination_server: "destination_user@destination_server_ip"
    ssh_key: "~/.ssh/id_rsa"  # Change to the correct SSH key
    max_copy_size: "500G"  # Maximum data copy per transfer
    check_interval: "1h"  # Interval between checks
    log_file: "/var/log/backup.log"
  
  tasks:
    - name: Install required packages
      apt:
        name: rsync
        state: present
  
    - name: Ensure SSH key exists for passwordless authentication
      ansible.builtin.copy:
        src: "{{ ssh_key }}.pub"
        dest: "/home/{{ ansible_user }}/.ssh/authorized_keys"
        remote_src: yes
  
    - name: Create backup script
      copy:
        dest: "/usr/local/bin/backup_script.sh"
        mode: "0755"
        content: |
          #!/bin/bash
          LOGFILE={{ log_file }}
          echo "Backup process started at $(date)" >> $LOGFILE
          
          # Check if jobs are running on the cluster
          JOBS_RUNNING=$(some_command_to_check_jobs)  # Replace with actual job-checking command
          if [[ "$JOBS_RUNNING" == "0" ]]; then
              echo "No jobs running, starting backup..." >> $LOGFILE
              rsync -az --progress --max-size={{ max_copy_size }} -e 'ssh -i {{ ssh_key }}' {{ source_dir }}/ {{ destination_server }}:{{ dest_dir }}/ >> $LOGFILE 2>&1
              echo "Backup completed at $(date)" >> $LOGFILE
          else
              echo "Jobs running, skipping backup." >> $LOGFILE
          fi
  
    - name: Create cron job for periodic backup
      ansible.builtin.cron:
        name: "Automated Cluster Data Backup"
        job: "/usr/local/bin/backup_script.sh"
        minute: "0"
        hour: "*/1"  # Runs every hour