[Snapshot Pro] Snapshot using a lot of CPU resources

I had emails from hosting company over the weekend saying I was close to using up my CPU requests limit. They sent me the email below with info which points at Snapshot as being 'to blame'. I've used Snapshot on this site for several months with no problems and it's been fine for a day or so since the incident. Any ideas why it might have triggered so many CPU requests that one day?
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Thank you for the patience.

I am sorry for the delayed response.

I investigated your case carefully and found out that just today to your site there were around 40 000 requests.

This was also true for your other website on your other account.

Please be advised that a request is essentially a script execution, which generates a CPU usage. High number of request can lead to high CPU usage and high server load.

I checked both of the accounts' access logs and found out that the majority of the requests were made by a plugin on your applications which is generating backups of your sites:
Code:
77.104.133.148 - - [11/May/2018:02:36:25 +0100] "POST /wp-admin/admin-ajax.php?action=snapshot-full_backup-respawn_cron&doing_wp_cron=1 HTTP/1.0" 200 - "https://www.scgp.org.uk/wp-admin/admin-ajax.php?action=snapshot-full_backup-respawn_cron&doing_wp_cron=1" "WordPress/4.9.5; https://www.scgp.org.uk"

77.104.133.107 - - [11/May/2018:02:33:37 +0100] "POST /wp-admin/admin-ajax.php?action=snapshot-full_backup-respawn_cron&doing_wp_cron=1 HTTP/1.0" 200 - "https://www.jessicafearnleybusinessconsulting.com/wp-admin/admin-ajax.php?action=snapshot-full_backup-respawn_cron&doing_wp_cron=1" "WordPress/4.9.5; https://www.jessicafearnleybusinessconsulting.com"

In this case please either deactivate the plugin or contact the plugin's support and ask them how you may decrease the activity of the said plugin to not make this high amount of requests to the account generating a high CPU usage in the process.

For any additional assistance, please do not hesitate to contact us.

Best Regards,

Donetian Petkov
Technical Support Team