Not really - but sort of.
There's no way to export everything to a CSV file. I've never seen that anyone has ever created a way to convert a downloaded data base - that would be pretty cool.
But.
There is something.
Back in the "old days" we used to dump the entire database to paper.
You can still do the same thing. (save it to a file)
Here's how you do it:
Telnet to the system.
Go to the maintenance section.
Enter "my lpr3"
Enter "fo all"
Set your terminal software to capture everything to file - depending on what software you're using you may have to set your PC to Print to File.
Enter "en pr/n"
If you want to stop the process for any reason you can enter a CTL-C. Then enter "Can print all"
Next go to lunch, go to dinner, go home, get plenty of sleep and then when you get back it might be done.
It will not be in CSV format and it will not have all the forms and all the info you may want but in general if you needed to rebuild a system from scratch this would be a good start.
Ralph