16:53:58 ~$ ssh-copy-id -p444 backupclientes@imasdetres.com
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
/usr/bin/ssh-copy-id: INFO: 2 key(s) remain to be installed -- if you are prompted now it is to install the new keys
backupclientes@imasdetres.com's password:

Number of key(s) added: 2

Now try logging into the machine, with:   "ssh -p '444' 'backupclientes@imasdetres.com'"
and check to make sure that only the key(s) you wanted were added.

16:54:45 ~$ ssh -p444 backupclientes@imasdetres.com whoami
backupclientes