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<p><a href="page.php?w=Database_replication">Database replication</a>, where copies of data on a <a href="page.php?w=database">database</a> are kept in sync, despite possible large geographical separation;<br/>
* <a href="page.php?w=Journaling_file_system">Journaling</a>, a technique used by many modern file systems to make sure that file metadata are updated on a disk in a coherent, consistent manner.</p>

<p><big>Challenges</big></p>
<p>Some of the challenges which user may face in data synchronization:<br/>
* data formats complexity;<br/>
* real-timeliness;<br/></p><p>
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