Sysadmin Learning about private/public keys. Some issues

I'm trying to create backups on backupsy from a server with WHM

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I could complete step 2:
Set up SSH public-key authentication to connect to a remote system

but then, after step 3 (after delete the other server password) I get the following error:

Code:

stdin: is not a tty
/root/.ssh/id_rsa_backupsy.pub: No such file or directory

However, the file is on the cpanel server:


Any suggestions?

 

Yes, that's the problem. Id_rsa_backupsy.pub should be copied to the other server but instead of get "the file has been created" or something like that I get the error saying the file doesn't exist