How do i restore my TFTP back up running-config onto my cisco router?

How do i restore my TFTP back up running-config onto my cisco router?
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copy tftp: startup-config

You will be asked for the ip address or hostname of the tftp server
And then the path to the config file. Usually the path is relative to the root of the tftp server which is usually a directory called tftpboot.

defreyAuthor Commented:
I have done the following in order to re-install the "good configuration" but the sh running-configuration is showing the current one, what step am i missing?                                                
It seems that the good configuration has been reloaded ok

Router#copy tftp: startup-config                                
Address or name of remote host []?                                              
Source filename []? run-conf.txt                                
Destination filename [startup-config]?                                      
Accessing tftp://                                            
Loading run-conf.txt from (via Vlan1): !                                                    
[OK - 1656 bytes]                
defreyAuthor Commented:
ok, it worked but using the following command:

copy tftp: running-config

So what is the difference between the 2:

copy tftp: running-config
copy tftp: startup-config

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