Scheduled Snapshots Not working

Got 25+ websites connected to The Hub and want them all to create backups to Google Drive at night, but scheduled snapshots isn't working.
https://static.livechatinc.com/8801096/P3K5EKXEA8/98328135ad09cf37fb5d140bd34f507b/Schermafbeelding%202018-01-26%20om%2008.46.22.png

However, the schedule backup are working fine with Updraft, and not Snapshots with default WP Cron. Cannot configure server crons in all sites. Looking to make this work with Snapshot in default WP Cron. Please check the chat notes for more info.