What command is used to create a backup configuration?

There are many ways to get copy of the configuration by TFTP, FTP server or by network software tools

If we are going to use TFTP server we have to do that below configuration after download and install tftp server software:

R1#copy running-config tftp:

Address or name of remote host []?10.1.3.250

Destination filename [R1-confg]? backup_cfg_for_my_router

!!

1030 bytes copied in2.489 secs (395 bytes/sec)

R1#