Rental License
Paid, fully-functional license that expires at the end of the contract which is the last day of the month and normally 1 month from the contract start date. Such a license type is distributed only to service providers.
Understanding Trial State
A trial state is given to each user account that is being backed up for the first time and lasts until the first day of the following month. During this period your rental license remains unconsumed by such accounts.
For example, you have three user accounts A, B and C to be backed up and the first session of a backup job is scheduled on January 13, 2019. In such a scenario, after the backup session, all three user accounts (i.e. A, B and C) will be given a trial state until February 1, 2019. On February 1, 2019, a trial state for each of these accounts will be automatically reset. After the trial state is reset, upon the next backup job session all three user accounts (A, B and C) start consuming a rental license immediately.
You can avoid consuming a rental license by trial accounts you no longer want to process. For example, you may not want to continue backing up the account B from the example above. For that, you can simply remove it from the backup job processing list, as described in Creating Backup Job. Consider doing so before the backup job session that may be scheduled after the trial state is already reset.
The restore abilities will continue to function regardless of the grace period state.