Retention period for backup in M365 Security Plus

When configuring a backup schedule, you need to specify the maximum amount of time a backup can be held in your repository. For example, if you have set a retention period of six months, it ensures that the backup held in your repository only holds information of all changes made in the preceding six months. When you configure a new backup schedule with a backup retention of six months, the following happens:

Note that the first backup alone is a complete backup and all consecutive backups are incremental. This how incremental backups work: assume a backup schedule is created on January 1, 2021 to perform a backup every Sunday at 12am. The retention period is set to one year. The first time the schedule will run is on January 3, 2021 at 12am. January 3, 2021 will be set as the starting point of the retention period.

All mailbox items that have their last modified entry from January 3, 2020 to January 3, 2021 will be backed up, as the age of the modified item will be less than the maximum retention period. Any item that has the last modified date earlier than January 3, 2020 will not be backed up.

Retention period for backups in M365 Security Plus

This retention policy is then applied to the backed-up data on the repository.

Considering the same example as above, the next installment of the backup will occur on January 10, 2021 at 12am. With January 10, 2021 set as the starting point of the retention period, M365 Security Plus will scan the backed-up data to find all items whose last modified time are earlier than January 10th, 2020. All items that fit the criteria are then removed from the repository.

Retention period for backups in M365 Security Plus

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