Cron job that backups log files

[luyanda]

How to write a cron job/s that does the following.

1) Backs up /opt/alfresco_xx to /opt/alfresco/backups (mount point)
   Include date and time in description (or date and 1, date and 2)
   Use tar in command to compress folder.
   Run cron job at (12:00) pm and 17:30 pm.
2) Checks for backups older than 2 days, and deletes them.
  
   Logs - Run Daily at 19:00 :
3) Stop repository
4) Move logs in /opt/alfresco_xx/tomcat/logs, to opt/alfresco/backups/logs
5) checks for log files, in backup folder, older than 3 days and deletes them
6) Start Repository

Please assist me!!

[mitpatoliya]

Looking at your requirement you cannot use Alfresco cron jobs to achieve this.
What you need to do is

create standalone JAVA utility which will do this for you.
Create a batch file which can invoke this utility.
Schedule Window cron job to execute this batch file at your specified time on daily basis.