Knowledge Discovery 25.1
Knowledge Discovery Expert

# Back Up and Restore the Data Index

There are a number of different methods that you can use to back up the Content component index. This section describes these methods, and discusses why you might use each one.

## DREBACKUP and DREINITIAL

The `DREBACKUP` index action creates a compressed backup of the Content data files. You can use this backup to restore Content at a later date using the `DREINITIAL` index action.

You can automatically schedule `DREBACKUP` index actions using the Content configuration file, or you can send them manually as an index action. By default, Content also automatically runs a `DREBACKUP` operation when it runs a scheduled DRECOMPACT operation. You can also request a backup during a manual `DRECOMPACT` operation, by using the `Backup` parameter.

Scheduled backups provide configuration options to define how often to create backups, when to create them, and how many to keep.

As an alternative to using index actions, you can back up and restore your server from the Backup/Restore tab on the Console page in the Control section of Knowledge Discovery Admin. You can reset the index by using the Initialize Content feature on the Service Control tab of the Console page in the Control section.

## DREEXPORTIDX, DREEXPORTXML, and DREEXPORTREMOTE

The `DREEXPORTIDX`, `DREEXPORTXML`, and `DREEXPORTREMOTE` index actions allow you to export all or a selection of documents from one Content component. You can use the export file to reindex at a later date (or immediately, in the case of `DREEXPORTREMOTE`).

You can use this method to implement configuration file changes that require reindexing, as well as offering restoration of your data.

NOTE: If you are not storing fields (the `NodeTableStoreContent` parameter is turned off), then you cannot transfer data associated with those fields using `DREEXPORT` index actions.

As an alternative to using index actions, you can export indexed documents from the Export tab on the Console page in the Control section of Knowledge Discovery Admin.

## ArchivePath

The `ArchivePath` configuration parameter allows you to configure a directory where the Content stores a copy of every index action it receives. You can replay the index actions and data to restore the state of a Content.

On its own, this method is a very slow way to restore a large Content from an empty state to a later state. However, you might want to combine a scheduled `DREBACKUP` index action with `ArchivePath`, to allow you to restore a more specific point in time. For example, you can restore from the `DREBACKUP` data, and then replay the index actions that were sent between the last backup and the required time.

## Manually Copy Content Data Files

You can back up a Content component by simply copying all its data files. OpenText strongly recommends using this method only while the Contentprocess is stopped, or paused using the `DREFLUSHANDPAUSE` index action. After you pause with `DREFLUSHANDPAUSE`, you can resume the process using the `IndexerGetStatus` action.

Related Topics

- Back Up Your Knowledge Discovery Installation

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Version 25.1 | Last updated January 2025

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Product: Knowledge Discovery 25.1

Topic Title: Back Up and Restore the Data Index