It sounds like you have extra schedules in your DB, can you do the following;
In your hosting Site Tools->Site->MySQL->phpMyAdmin, open your database
Search the database for any table named ‘wp_X_options’, where X is a number. (PLEASE NOTE: Do NOT make any changes to the main ‘wp_options’ table
In each table, select ‘Search’ and enter the following:
Column name: ‘option_name’
Operator: ‘LIKE %…%’
Value: ‘updraft’
This will bring up all UpdraftPlus options in the table. Delete any rows relating to your remote storage
In the same table, Search for a row with option_name = ‘cron’. Delete this row
Repeat for each subsite table