Thanks for sharing this question/challenge.
You are correct, the older Factory Floor controllers do not have a file/ftp server like the newer PAC Controllers have. (Some of the new PAC Controllers now have MicroSD cards for storing data.)
But you still have lots of ways of communicating, and lots of options for data recording. What are you currently using to write data to the database? Do you know why some data goes missing? (Flaky network?) Can you (would you want to) change your Factory Floor strategy at all?
Could you perhaps use OptoDisplay to do Historic Data Logs? How much data are we talking, just one point, or lots of different kinds of data? If you are recording I/O Point data, what kind of I/O Unit(s)?
Without replacing the existing Factory Floor hardware, you could always drop another PAC controller in the mix (super easy if all your I/O Units are Ethernet, possible in some cases if not). Then you could do whatever recording you wanted on the PAC controller as you did before, and let the Factory Floor controller carry on, unaffected. (I've noticed sometimes the money I spend on a little new hardware is worth a whole lots of time saved trying to get old stuff to work.)
In any case, do tell us more about the problem(s) you're trying to solve. Lots of friendly folks around here that are happy to jump in with suggestions and ideas.
Thanks & write on!