You must have a paid subscription in order to receive free backups. Free backups are added to the quota of your subscription.
Note: Free private repository backups cannot be retroactively applied to an account.
In your BackHub account there is a unique invitation link to invite new users to BackHub.
For each new user who signs into BackHub for the first time with your invitation link, you receive 10 free repository backups as long as the new user (1) purchases a paid plan, and (2) the new account stays active for at least 1 month after the 14 day free trial.
To receive 10 free private repository backups when signing up with an invitation link, the user must purchase a paid plan and have cookies activated when opening the invitation link. After opening the invitation they start installation from there.