Any email client that store emails in individual files?

I have been using "windows live mail" since its start(¿2007?), even on Windows 10. I think its a very Good program but since microsoft no longer updates the app as obsolete, I would like to switch to another mail client but I have a problem.
I know other good apps like thunderbird and others, but they all store all the emails in a single file and this doesnt work for me, Windows Live mail store email on individual files
I have configured differential backups and using windows live mail I only increase the backup by a few Kbs when I receive or delete emails, but with other applications just by receiving or deleting one email the differential backup re-backs up all the emails, because the only file in which they are stored has changed.
And in my company email take up a lot of space… Daily backup would take up too much space
Thanks

eM Client

Ok, i will try

Thanks

You can 'Save As' individual emails by right click,

you can export entire folders of saved emails as individual files,

you can even drag and drop straight from the UI into a folder...

The Windows 10 Mail App will do that.
Display the Email > 3 dots > Save as >
It will save the Emails as a *.EML file.
That can be opened by the Mail App.

It is meant for Home users with modest requirements not company Email which should use something a lot more professional.

Thank you but I don't want to save the emails in individual files, I want the mail client to store the emails in individual files to be able to configure my backup program in mode "differential copies"