Well I suppose the default storage being the SSD in the camera I guess you could say that that is local storage.
The only other option is Cloud Storage. More information about that here:
Note that it requires additional cloud archive licenses. The SKUs are in the datasheet I linked above.
I think you may be referring to a DVR/NVR type device? There's no option for that in Meraki. The closest to that is the cloud archive option I mentioned earlier.
The way to access cloud archive footage is identical to the regular way of accessing footage stored on a Meraki camera. In fact it works pretty transparent to the end-user. So the export features are the same. More info about them here:
I'm afraid that's not the answer you were hoping for.