GoodSync might be a bit more popular than MailSteward. We know about 1 link to it since March 2021 and only 1 link to MailSteward. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Yes, this and MailSteward are great for this. I've use MailSteward because it lets me archive to my own MySQL database, but I have to warn that its developer rolls out paid upgrades WAY too often -- it might as well be subscription-based. Source: over 1 year ago
Or check out goodsync.com I think the free version might work as well. Source: over 2 years ago
Mail Backup X - Your one stop mail backup and archiving tool for Mac.
FreeFileSync - FreeFileSync is a free open source data backup software that helps you synchronize files and folders on Windows, Linux and macOS.
MailStore - MailStore Home - A 100% free single-private-user desktop solution
rsync - rsync is a file transfer program for Unix systems. rsync uses the "rsync algorithm" which provides a very fast method for bringing remote files into sync.
Gmvault - Backup the emails in your Gmail account.
Duplicati - Free backup software to store backups online with strong encryption. Works with FTP, SSH, WebDAV, OneDrive, Amazon S3, Google Drive and many others.