How to backup and file your Cloud based mail:

hackWHY?
It’s common practice to have IMAP, iCloud, GoogleMAIL etc email addresses. Many people store and file all their mail in one or many of these Cloud based mail systems.
If/When these accounts are hacked the criminal will not only attempt his extortion tricks on your address book contacts, they might delete all your mail.
Did you get that?
If your account is hacked you could loose all your email if the only copy is Cloud based.

FIX: (Only Apple Mail covered although the same technique can be used by most email applications)

Assuming you have Apple Mail setup with your Cloud based accounts.
Launch Apple Mail.
In the Menu at the top of the screen use the Mailbox Menu and select New Mailbox. New Mailbox option is ½ way down this list.
See Pic below:
mail1

 
A new floating window will appear.

See Pic below:

mail3

 

 

 

 

 

Ensure that the Location says On My Mac. You might have to click on the drop down menu to select On My Mac if it is not already selected.

Type in your new mailbox name and click OK.

You will see your new mailbox appear in the left column of Apple Mail.

See Pic below:

mail2

 

 

 

 

 

 

 

You can now HOLD DOWN THE ALT KEY and click and drag from your Cloud based mail accounts into this folder structure.

This makes a copy of the dragged mail locally On Your Mac ☺

Mail stored in the On My Mac section of Apple mail cannot be deleted if your online mail accounts are hacked.

You should have a Time Machine backup of your Mac. As your mail is now filed On Your Mac, it will be part of the Time Machine backup.