Ah, I think we are getting close here!
You need an
expect "ssword:"
between your send of username and password.
Also, for the two "expect"s within the "conf" arm, I would take out the "Miltonvale" bit and use:
expect "(config)# "
This loses the Miltonvale (which is, I assume, a name specific to that machine, so makes the script no use on other remote machines).
After the "expect" commands complete, it may be a good idea to insert a small pause, to allow the remote machine to complete the prompt and be ready for your input. For example:
sleep 0.2
The "sleep 5" at the end gives the network device time to log off before the script abruptly terminates. "expect eof" might be tidier, but "sleep 5" is easier and more certain!
To avoid the "Press (Q: quit" bit, you may need to send a command to turn off paging on the remote machine (something like "set nopage"? - see the manual for that remote machine to find out). you would send this as soon as your see the main prompt (in your script, the expect for "Miltonvale# ", which I would replace with
expect "# "
so your script becomes (assuming that the no-page command is "set nopage"):
#!/usr/bin/expect --
set timeout -1
spawn telnet 10.100.72.211
expect "Login:"
sleep 0.2
send -- "username\r"
expect "ssword:"
sleep 0.2
send -- "password\r"
expect "# "
sleep 0.2
send -- "set nopage\r"
expect "# "
sleep 0.2
send -- "conf\r"
expect "(config)# "
sleep 0.2
send -- "set control db-backup\r"
expect "(config)# "
sleep 0.2
send -- "logo\r"
sleep 5
