# remote linux computer: 192.168.0.62 / example user: mybackup

# fist create user on remote machine: (don't forget password).

sudo adduser mybackup

# then, on local machine, generate public rsa key of our user. 
# using local user (to be conected to remote) at user's home do:

ssh-keygen -t rsa

# to answer each question just press [ENTER].

# then from local folder user's home (/home/mybackup):

# 1) Create .ssh directory on remote machine:

ssh mybackup@192.168.0.62 mkdir -p .ssh

# 2) Copy generated key:

cat .ssh/id_rsa.pub | ssh mybackup@192.168.0.62 'cat >> .ssh/authorized_keys'

# 3) Change permissions:

ssh mybackup@192.168.0.62 "chmod 700 .ssh; chmod 640 .ssh/authorized_keys"

# 4) Test your login: (it must work without password):

ssh mybackup@192.168.0.62