iCloud vs Local

Considering a purchase, but: I need to have the database available on my laptop even when not connected to the internet. But I also want to be able to work on the database on a different computer when at home with both computers connected. Is there a straightforward way of reconciling these needs? E.g, (a) does the iCloud option still keep a copy locally which syncs on re-connection; or (b) can I tell Ninox to keep its files in a Dropbox or Google Drive folder?