Synchronisation is important for remote users who do not have constant connectivity.
There are several FileMaker 'Add-ons' that provide automatic sync of filemaker records. One such solution is MirrorSync.
In this YouTube video Jesse Barnum, of 360 Works, and Richard Carlton discuss and demo the new MirrorSync 2 FileMaker extension.
Starting with a single user is free. For more users there are incremental licensing costs.