Hi,

If we're talking about a solution hosted in the Optimizely DXP service, you can sync content from higher to lower environments via the PaaS portal so you should be able to sync content down from production to UAT fairly easily whenever you need to. When you're working on a site prior to launch, environments will only be provisioned as required and each environment will be provisioned with a copy of the environment below however this is pretty much a one-time process. If you need to overwrite production with the contents of UAT after you've provisioned the production environment, you'd need to raise a ticket with support.

More generally, there's a content import/export tool in the CMS admin which will let you export all or parts of the site to import elsewhere though I'd suggest trying it in non-production environments before you try it in production.

Futher to Paul's excellent response, depending on the amount of content to migrate using the Import / Export tools, you may want to split this into batches for sections of your content tree.  I've encountered issues before where the process has timedout or the export file is too large to be uploaded.  There is also an Upload and Verify option that would hopefully identify any initial issues for you.

It should also be noted that the "Update existing content items with matching ID" refers to a UID assigned to the content rather than it's Integer Id and so it should be safe if you are uploading multiple import files if you tick this.

I cannot reiterate how important it is to test this import on another environment to production first.

AND adding to Paul and Mark's responses - just wanted to emphasize that the "content sync" option from production to UAT is not a merge, but an overwrite. So when doing it, you will basically copy the production database and overwrite the UAT database. 

This might be what you want, but in some cases I know people use UAT for various testing/showcasing, and that content would be lost when doing a "copy down" from production. FYI!

Hi Chien,

I agree with Paul answer, with DXP service it's fairly easy.

If you are looking for another way, you can always use export and import services or develop Custom Scripts, create SJ for that.