One of the usual best features of open source software is the freedom to choose other options and have no vendor lock-in. Right now OpenBiblio doesn't offer an option (no web nor command line) to export all (or a set of) bibliographics records (and also authorities).
This shouldn't be so difficult, just a foreach all records and export them to an MRC file (ISO 2709).
Regards,
Pablo
Totally agree on the freedom. Actually the lock-in isn't so bad right now, as I explained on the forum https://sourceforge.net/p/obiblio/discussion/164978/thread/d9113c32/#adc6/872f
Here's a link to the layout script that the report system of 10-wip uses to produce a MARC file: https://bitbucket.org/mstetson/obiblio-10-wip/src/tip/layouts/default/marc.php?at=default
I'm not sure it would be worth the effort to try to make this work for 0.x.x, especially because of https://bitbucket.org/mstetson/obiblio/issue/1
Authorities are not implemented in any version of OpenBiblio.