Apple Mapped Remote Drive Access (off network)

Long shot here …

My wife has a MAC (I’m a PC person) and I would like to somehow map a drive to Drobo that is accessible both from my home network and away from my home network. Right now it’s mapped to the local IP address, but when off network is it possible to somehow keeps that map (maybe through Is that possible or already discussed (I searched and didn’t see anything).

More specifically (for those who might use Lightroom), I would like to setup Lightroom so that she can access pictures stored on the Drobo both at home and while she is out in the field. Lightroom uses catalogs / mapped drives to store photo catalogs.