pre_auto_update messages sent to main site email address

I have backup notifications sent to a different email address than the main site admin address (to keep things clean). It’s worked for months, getting only the final “new backup generated” messages. Recently, the main admin email address started getting mail about the intermediate pre_auto_update steps, for example:

From: XCloner Backup <****@****>
Sent: Tuesday, September 18, 2018 11:57 AM
To: <****@****>
Subject: pre_auto_update – new backup generated backup_pre_auto_update_translation_********************

Generated Backup Size: 26 MB

Total files added: 689

Backup Parts: 1

Backup Site Url: ***

The main admin doesn’t want these. Any ideas why they started up? The last time anything possibly relevant was mentioned in the changelog was in 4.0.7 — “added log fixes for WordPress cron”.

Thanks.