got-your-back VS imapbackup

i THINK a mail client can do that or maybe this      https://github.com/jay0lee/got-your-back/wiki

https://github.com/jay0lee/got-your-back/wiki - free Gmail backup/restore utility, command-line only

https://github.com/jay0lee/got-your-back or email client with IMAP (drag drop your stuff)

There's also a fantastic tool by Jay Lee that will do it in an automated fashion

https://github.com/jay0lee/got-your-back

If you need to import an MBOX go for Got Your Back ( https://github.com/jay0lee/got-your-back ).

I suggest using https://github.com/jay0lee/got-your-back for gmail.

It works better because it can copy rules, labels, stars, etc.

In terms of backup you could do incremental backups, example here in python - not tested by me personally but seems good.

If you want it totally DIY https://github.com/rcarmo/imapbackup and then any flat text search.

Check this out, you can use it with bridge https://github.com/rcarmo/imapbackup

If you have access to the server you could make backups on that end (that is what we where doing) if you dont have access to the server you would need to login to each mailbox to create the backup i suppose. Dont know which tools are good for that but i found this one it might help: https://github.com/rcarmo/imapbackup

There are loads of imap backup options from a quick search, such as https://github.com/rcarmo/imapbackup