Insufficient free space

This article describes the troubleshooting for the following backup error for a protected Windows machine:

Agent Export error occurred mid transfer (SNAPSHOT_INSUFFICIENT_FREE_SPACE - The 792ea9c5-2562-42bc-ad14-d5dbda1b485b (C:) volume requires 1 GiB free space to perform a backup.)

The volume label and Identifier will change based on the production machine and the volume that is experiencing the error.

Environment

  • Datto SIRIS
  • Datto ALTO

Description

This error can be caused by a lack of local storage available on the protected machine. The amount of space required by the agent will depend on the agent version.

  • For versions 3.0 (current production release) and above of the Datto Windows Agent, 1 GB of free space each protected volume is the minimum required.

  • For version 2.1 of the Datto Windows Agent, if 10% of the volume is larger than 10 GB, the file's size will be 10 GB, regardless of the total size of the protected volume. The minimum size of the file will be 1GB.

  • For versions 2.0 and below of the Datto Windows Agent, if the volume is large enough that 10 GB is less than 10% of the total disk space, the agent will use the percentage of the volume's size that is closest to and is at least 10 GB. For example, for a 560 GB volume, the COW file size will be 2% of the volume and be about 11.2 GB in size

In all sizing scenarios, the agent requires an additional 2 GB of free space for operational overhead. There may be exceptions to the above guidelines where more space may be required.