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Eonvelope vs Mail Backup X: catalog facts
Eonvelope	Mail Backup X
Free Free and open source under the AGPL-3.0 licence.	Paid Free to try, with a paid licence to keep using it.
Web, Self-hosted	Windows, macOS
Supports IMAP, POP, Exchange and JMAP Thread detection and separate storage of attachments and correspondents	Supports many desktop clients and online mail services Archive viewer and format converter included
Requires running a Docker stack and accessing it over HTTPS Smaller project with a short track record	Proprietary and paid after the trial Developer details are not clear from the site
Self-hosted	Downloadable app
Open source	Closed source
License: AGPL-3.0	License not stated
Not stated if an account is needed	Not stated if an account is needed
Not stated if it works offline	Not stated if it works offline
Official website Full listing and sources Checked October 2, 2026	Official website Full listing and sources Checked September 24, 2026

Catalog facts only. Anything “not stated” is unconfirmed. Check full listings for details.