Permission Set Editor
The Permission Set editor provides fine grained control for the restore of a Salesforce permission set.
Warning: Restoring a Permission Set completely replaces its definition in Salesforce. Unlike Profile restores, Permission Set restores DO NOT incrementally change a Permission Set.
For a partial restore, specific sub-components of a Permission Set are selected for the restore. A partial restore is typically used when migrating a Permission Set to a new environment where the original Permission Set contains entries related to objects/fields are not in the target Salesforce.
A complete restore will cause all properties of a Permission Set to be deployed.