Web App
Back Up Only New Yahoo Mail Messages
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Compare selected saved messages with a previous local backup manifest and export new or changed message copies with an updated manifest.
Screenshot
Inspect the interface
Description
What is this software?
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Compare selected saved messages with a previous local backup manifest and export new or changed message copies with an updated manifest.
Features
- Compare selected saved messages with a previous local backup manifest and export new or changed message copies with an updated manifest.
- Optionally use previous backup manifest (json) alongside the selected saved messages.
- Review the results and download the retained output ZIP without reopening the source files.
Work with locally selected EML or MBOX exports, including supported messages inside ZIP files. This app processes the files in your browser and does not connect to a live mailbox. Compare selected saved messages with a previous local backup manifest and export new or changed message copies with an updated manifest.
Features
- Compare selected saved messages with a previous local backup manifest and export new or changed message copies with an updated manifest.
- Optionally use previous backup manifest (json) alongside the selected saved messages.
- Review the results and download the retained output ZIP without reopening the source files.

