Hello,
Below is the configuration to set automatic backup of your cisco devices to TFTP server.
Goto Router config mode
#kron policy-list backup
# cli copy running-config tftp://!IP Of your TFTP server!/!Host name!
!remove esclamation
kron occurrence backup at 23:00 !time! recurring
policy-list backup
ON ASA
On ASA we cannot give Kron command so we need to use Event manager, below is the config
event manager applet backup
event timer absolute time 23:42:00
action 0 cli command "copy /noconfirm running-config tftp://!IP Of your TFTP server!/!Host name!"
If you face any issue you can comment.

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