netcat common usage

do you have several servers?
do you transfer data between them?

time to time I transfer data between servers and in most cases I use

scp local-file user@host:/path/remote-file

scp user@host:/path/remove-file

for this task netcat is useful too, so it can be like this
server side

nc -l -p 12121 > local-file

cat local-file | nc host 12121

of course 12121 need to be replaced with something random because "nc" don't provide authentication and encryption