Automatic backup of BIGIP LTM

if you do a google search you can find many options for building these type of scripts. such as this one https://devcentral.f5.com/wiki/advdesignconfig.BIG-IP-10-2-backup-script-with-SCP-transfer.ashx

Also as Syafiq mentioned above Bhattman has a good script posted you can modify it as needed to your requirements.