Will anyone else be modifying the data but you? If not, you can simply use iTunes to copy your file from the iPad back to your computer when you return to the office.
If others may have modified data, you'll have to set up a "synch" method that merges the data. Two 3rd party developers: 360works and SeedCode offer such a product.
If you are up to the design and scripting needed, you could also set up your own method for such a synch. See this document from FileMaker on the subject: http://www.filemaker.com/solutions/ios/docs/fmi_guide_sync_en.pdf
Hi Phil.. I'm pretty comfortable with the coding side so will definitely have a go at this part myself. Always worth a try!! Thanks for the advice. Much appreciated