Does Apple Mail backup non-iCloud emails to iCloud if used with multiple email accounts
I use Apple Mail on MacOSX to manage multiple email accounts. I want to create and use an iCloud email account but I do NOT want to use any other iCloud features and I do NOT want emails sent/received from non-Apple email accounts to be backed up to iCloud.
Please can someone confirm whether Mail ONLY backs up email sent/received through the iCloud account to iCloud and not email from other accounts?
Also please can someone confirm that with only Mail activated in iCloud that no apps with back up data to iCloud (TextEdit for example)?
Thanks.