OK for the files but what about the LAN? are your 2 boxes on same LAN? Is it an dedicated LAN, INTRANET or what? At what speed etc...
I have seen CISCO sitches drop by FTP transfers... (OK with really big files...and in certain conditions...).
My way of seing things:
In unix you loose priviledge as time passes and can to the extreme finish with something almost never ending...
So I would test the transfer time and be sure that in your normal conditions in doesnt exceed 5minutes, for it can change drastically depending of boxes charges both ways (one willing - the other overloaded...)