I've a PDF form to track what I eat, I'd like to be able to fill this form out on my laptop, my home PC and my workstation during the day.

Is there some easy way to sync the form data between machines? I've a owncloud on my own server that I use to sync files between all of these PCs, the PDF file is already being synced with owncloud.

I know the form data is stored in a xml file under $HOME/.kde/share/apps/okular/docdata/, if these XML-files could just be stored in the same dir as the PDF-file it would solve the problem. Is this possible?

Form data should usually be stored within the PDF file itself, rather than in the docdata/ directory, although this may depend on your version of Poppler.
As a workaround, you might want to try symlinking the docdata/ directory to a location synced to Dropbox on each system.

@bcooksley
Thank you for your reply.

The data is not stored in the file, I just tried opening it in another viewer.
I can't select "Save" in Okular, only "Save as...".

I'm running Debian Jessie with KDE 4.11.5.
libpoppler-qt4 is version 0.22.5

Do you know which version of poppler is needed?

I've thought about linking the docdata/ folder, I would prefer another solution but if that is the only way I'll do that.

If you perform a "Save As" for the file after entering data into the form, does that preserve it?