A client wants to perform incremental webgisdr backups daily and full backups weekly. They store all data in the relational ArcGIS Data Store, with no tile or map caches. Which action is required to enable incremental backups?

The webgisdr utility's incremental backup mode relies on the functionality of the relational ArcGIS Data Store. To create an incremental backup, the tool needs access to the database transaction logs (also known as write-ahead logs or WALs) that have been generated since the last full backup. Enabling point-in-time recovery (PITR) on the relational data store is the specific action that configures it to continuously archive these transaction logs. Without PITR enabled, the logs are not preserved, and webgisdr cannot perform an incremental backup, only a full one.

A. Increasing the heap size is a performance tuning action for memory allocation; it does not enable specific backup functionalities.
C. Decreasing max connections is a database resource management setting to control load, not a prerequisite for enabling incremental backups.

1. Esri ArcGIS Enterprise Documentation. "ArcGIS Enterprise backups". Section: Backup modes. "To create incremental backups of your ArcGIS Enterprise deployment, you must configure the relational data store for point-in-time recovery."

2. Esri ArcGIS Enterprise Documentation. "Manage data store backups". Section: Create a data store backup. "To create incremental backups of the relational data store, you must enable point-in-time recovery. When you do this, the relational data store is configured to archive database transaction log files..."

3. Esri ArcGIS Enterprise Documentation. "configuredatastore". This command utility reference shows the --enable-pitr true parameter, which is the specific command used to enable point-in-time recovery on a relational data store, a prerequisite for incremental backups.