Savings' database is located in ~/Library/Application Support/Savings. Just copy that folder into the target Mac at the same location. The important thing is to make sure Savings is not running on both Macs while you make the transfer, so there is no stale data in memory, which would lead to corrupt database.
As for the ability to access the same database on two Macs, and have changes sync automatically, that feature is currently being developed. It's not a simple feature, even with technologies like iCloud. I will make announcements on that when something is ready for release.
Yi