Pasting into terminal windows and assuming all is good is a bad practice.
Nowerec cisco states limtiations for the simple reason is not possible to do so.
Serial connnections will routinely drop chunks, telnet conenctions will work better not still nothing is guaranteed.
You can use cose "copy ftp://x.x.x.x/fileame running-config" for guaranteed delivery of commands to router.
Otherwise the operator has to visually check that everything went well.