Linking shared from ryan should give enough information.
If case backing up large repository you may know Data Store store holds large binaries and are only stored once. To reduce the backup time remove the datastore from the backup by following [1] (CQ 5.3 example)
[1] In order to remove the datastore from the backup you will need to do the following:
Assuming your repository is under /website/crx/repository and you want to move your datastore to /website/crx/datastore
stop the crx instance
mv /website/crx/repository/shared/repository/datastore /website/crx/
Then modify repository.xml by adding the new path configuration to the DataStore element.
Before:
<DataStore class="org.apache.jackrabbit.core.data.FileDataStore">
<param name="minRecordLength" value="4096"/>
</DataStore>
After:
<DataStore class="org.apache.jackrabbit.core.data.FileDataStore">
<param name="path" value="/website/crx/datastore"/>
<param name="minRecordLength" value="4096"/>
</DataStore>
After doing this then you can safely run separate backups on the datastore while the system is running without affecting performance very much.
Following our example, you could use rsync to backup the datstore:
rsync --av --ignore-existing /website/crx/datastore /website/backup/datastore
