What Needs to be Backed Up

The directory you expanded the tar.gz file would look somthing like this.

The data that needs to get backed up are the following 2 directories.

How to Back Up

To backup, shutdown Collaboration Server, and copy the above 2 directories to your storage for backup.

How to Restore from Backup

To restore from backup, while Collaboration Server is shutdown, replace the above 2 directories with the backup, and then start Collaboration Server.