When a volume on a FlashArray is shrunk (truncated), Purity//FA automatically creates a pre-shrink snapshot to protect against accidental data loss. This snapshot captures the state of the volume at its original, larger size. The snapshot is named with the original volume name plus a timestamp and a -shrink suffix (e.g., vol1-2023-10-27-15-00-00-shrink). This protection snapshot is immediately moved to the "Destroyed" items folder. The administrator can recover the data by locating this snapshot, restoring it to a new volume, and copying the required data.

B: Creating a snapshot of the current volume would only capture the already truncated 1GB of data, not the data that was lost.

C: Reverting the volume to the original size (resizing it back to 1PB) only allocates the space; it does not restore the truncated data blocks.

Pure Storage, "Purity//FA User Guide," (for Purity 6.x), Section: "Storage > Volumes > Resizing a Volume". The documentation states: "When a volume is truncated, Purity automatically creates a snapshot of the volume before it is truncated... The snapshot is moved to the Destroyed Volumes folder."

Pure Storage Knowledge Base, Article "How to Recover Data from an Accidentally Shrunk/Truncated Volume". This article details the exact procedure, which involves finding the auto-generated snapshot in the destroyed items and using it for recovery.