My thoughts below:Internationalization - the tool will support as many languages as you want. If you talking about adding additional language for sites you manage in the tool see the translation and multi-site manager sections of the documentation (https://docs.adobe.com/docs/en/aem/6-2/administer/s...

You wouldn't normally be deploying templates and components via OSGI - how did you template and component scripts get deployed to your author server. Bottom line is whatever steps you used to deploy your code to you author server you need to repeat on your publish server?

Have you deployed your code to the publish server? You mean using the eclipse archetype so I assume you have created your own templates and components. In addition to deploying you code to the author server you also have to deploy it to the publish server. 

Are the photos that are uploaded by this script isolated from other DAM Assets. So in your example in /path/to/our/photos - are there other assets managed by users, or is that path just photos uploaded by your script. If they are just photos uploaded by your script you could create copy of the stand...

That URL would work for an image asset - but the asset you are referencing is a mp4 - only thumbnails are created for an MP4. That URL pattern should work with an image asset. 

Almost all your storage in the data store (binary files) not tar files. Are you sure someone didn't upload some really large files to either the DAM or the Package Manager. If something is the repository is holding onto a reference to a binary file the data store garbage collection isn't going to re...

Have you considered that you optimized the repository size as much as it's going to be optimized? How large is the repository on disk - what's the size of the tar files and what's the size of the data store? Why do you think repository should be smaller?

I didn't see TarPM optimization in your list? Are you sure the tar file optimization is running to completion? If it doesn't finish within it's schedule window it may not be catching everything. You can start Tar file optimization from the console and then it runs to completion. This may take many h...

Are you actually sure that the process is still running? It's possible that the process either never launched or ended abnormally but left the workflow in a stalled state. Have you checked the logs around the time the workflow kicked off for error messages that might indicate a problem in the proces...