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# Back up the IDOL Servers

The `DREBACKUP` index action allows the DIH to back up the data in its child IDOL Servers, to create a safe copies of the data. You can subsequently use a `DREINITIAL` index action to restore the backed up files to the IDOL Servers.

To back up IDOL Server

1. Send a `DRECOMPACT` index action to the DIH to compress the connected IDOL Servers (see Compact the IDOL Servers).

2. Send the following action from your Web browser to copy all the IDOL Server `*.DB` files to a new location:

       http://DIHhost:IndexPort/DREBACKUP?Path=Path

   When you send this action to the DIH instead of to an IDOL Server, note:

   - `DIHhost` is the IP address (or name) of the machine on which the DIH is installed, `IndexPort` is the number of the port that you use to send index actions to the DIH, and `Path` is the path to the location where you want to create the IDOL Server backup.
   - If the IDOL Servers are installed on different machines, you must ensure that the specified path is a valid directory path on each of the machines.
   - If any two IDOL Servers are installed on one machine, you can specify a relative path. However, you must ensure that multiple IDOL Servers do not back up to the same location.

To restore backed-up data to IDOL Server

- Send the following action from your Web browser to restore the files to all databases on all child IDOL Servers:

      http://DIHhost:IndexPort/DREINITIAL?Path=Path

  When you send this action to the DIH instead of to an IDOL Server, note:

  - `DIHhost` is the IP address (or name) of the machine on which the DIH is installed, `IndexPort` is the number of the port that you use to send index actions to the DIH, and `Path` is the path (previously specified in `DRECOMPACT`) to the location to store the IDOL Server backups.

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