Safe Write vs Local History for Unsaved File Preservation

Preventing Data Loss During System Failures

PhpStorm provides two distinct mechanisms to protect file integrity during unexpected IDE crashes or power failures: Safe Write and Local History. While both aim to prevent data loss, they operate on different layers of the file system and application state.

Safe Write prevents file corruption by writing changes to a temporary file before replacing the original. Local History maintains a timeline of snapshots based on specific intervals or actions, allowing for the recovery of previous states regardless of the final file commit.

Constraint: Unsaved Change Recovery

The primary uncertainty arises when a crash occurs between a user's edit and the final disk commit. Safe Write ensures the existing file is not corrupted, but it does not inherently guarantee that the most recent unsaved buffer is recoverable. Conversely, Local History captures states periodically, but there is a gap between the last automatic checkpoint and the moment of failure.

• Does Safe Write's temporary file mechanism provide a reliable recovery path for the current buffer if the IDE is terminated before the rename operation?
• In a scenario where both are enabled, which feature serves as the authoritative recovery point for the most recent unsaved changes?