How to do automatic versioning of asset in DAY CQ?

Through CQ it can be done as follows : http://dev.day.com/docs/en/cq/current/dam/cq5_dam_version_management.html

Let us see, is there a way where we can configure the versions to be created automatically when an asset is modified externally and uploaded back with same name?


You could do the same using VersionManager API and eventlistner. Please look at http://www.day.com/specs/jcr/2.0/15_Versioning.html. A sample example is provided @ http://wiki.apache.org/jackrabbit/ExamplesPage#Versioning_Basics.

Creating versions of a content element (including assets) is a powerful feature within the content repository API. CQ takes advantage of this feature, e.g. when you activate a page a version is created automatically.

You have to though be aware that creating versions takes a toll on your disk space. Every version created is a snapshot of the last content-element (usually the Web page). And the version folder grows fast and huge.

When you activate a 'page', a version is created automatically. However, you can always have CQ create versions automatically, although we recommend to be cautious with creating versions for assets (due to the asset size and the disk space consumption). If  want to create asset versions automatically, you want to first think when is the best time to do so. This could be e.g. when you update an asset or when you activate an asset. In both cases you can update workflows (DAM Update and/or Activate workflows).

Another way : You can also try to make changes on a page and then check "Sidekick" to see if a version has been created. Then you can do the same thing with an asset, e.g. change some meta data.