The minimum number of backups is now three. Would love to see the option for two and one as well.
Reason: the space projects take on my disks and my cloud service.
With Time Machine I already have previous versions when I might need them.
Thank you,
Marc
It’s possible to disable automatic backups altogether, either on a per project basis (Project → Project Settings → Backup) or overall (Scrivener → Preferences → Backups). Obviously you should make sure you have a trustworthy alternative before you do this.
If you do disable automatic backups, you can make a manual backup at any time with the File → backup → Backup Now command.
Katherine
Thank you Katherine,
Yes I know that. And I can also delete some doublures manually.
Even so, this is on my wish list 
This isn’t a comment on the wish list item. Hopefully, the OP and everyone else are consistently practicing extensive backup strategies.
Time Machine was mentioned so it’s worthwhile to note best practices for its use with Scrivener. From Scrivener’s manual:
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