Cloudiway VS isync (mbsync)

I used https://cloudiway.com/ for about 40 users for gmail and good drive migrations and it allows iterative migration by user etc. Source: over 2 years ago

There are also isync and OfflineIMAP which sync email locally. Source: 11 months ago

I set up mbsync to mirror the current (last 90 days) of my Fastmail IMAP account into another local Maildir, and told Notmuch to index that as well. This ensures a Notmuch search will cover both current & archived messages. Source: 12 months ago

On my notebook I went full-on nerd and read and write emails mostly in the Emacs text editor. In particular I use isync to fetch emails via imap (that's independent from Emacs) and the Emacs extension mu4e to view, write and send emails. It's not something I recommend if you're not used to working with code and not using Emacs anyway, but for me it makes sense, since emails are just text and Emacs is good with... Source: about 1 year ago

Myself, I keep a local copy of my mail using isync/mbsync. This allows me to use mutt and notmuch on my mail, or even just plain old grep. Granted, this also means you'll have to download your 30GB mailbox locally. Personally, I consider this a feature, as it gives me a local backup. Source: about 1 year ago

I don't know what this means, but my setup assumes mail is in ~/Maildir. However you get your mail into this directory doesn't matter. I use IMAP and https://isync.sourceforge.io. Source: over 1 year ago