Backup render as autosave for file

As a frustrated blender user when this soft is crashed often loosing render files, I want to have some partial renders that was done before crash , so that for this need:

• autosave file of current state from rendering
• autosave by progress as precent of whole process from render (eg. each 1%, 5%, 10%, 25% - any own value)
• autosave for layers

Reason for request is, coz often exist huge projects for render, especially with glass, light reflections and I often have issue that Blender is crashed and no have result after hours of render.. then sometimes to prevent I'm taking the screen shoot to clipboard and paste to Paint, but due leak functions as bellow it's not good method for save (limited resolution from standards, etc. - due window belts/tools). Due this material often not need more render maybe, coz quality is enough but.. tasks.. and need to get any file.

• Improvement for Render Result window - tools, progress

• Separate render result from other images (skins, material etc.)

• Save Render image when rendering