When configuring the initial backup job, you may choose to apply an Inclusion filter against the content within the selected mailbox folders. This filter is based on the modification date of each item within the group and is designed to Include the content within the specified time period (by Date or by Range), not Exclude.
Please review the following scenarios to determine which setting is best for your backup needs. Please note that the initial filter configuration will impact how Updates (Full, Incremental, and Differential) are performed, so choose wisely.
Each configuration includes a chart displaying what will be included (green bar) versus what will be excluded (red bar). The bar on the bottom represents the initial Full backup and each above it represents the updates that can be performed.
When this filter is chosen, the backup will only include items that were modified after the date specified and never items from before the date.
When this filter is chosen, the backup will only include items that were modified within the specified time range from the start of the backup operation ([Today]) going back by the amount of time defined (for example, as configured with 45 days the Full backup will only include 45 days worth of items, from "Today" going back).
When this filter is chosen, the backup will only include items that were modified prior to the date specified and never after it. Due to this static starting Date and only including items prior, Incremental and Differential updates do not apply to this configuration since the amount of items will not change.