
Explanation:
Box 1: The Microsoft Exchange Online mailboxes of each Team1 member
Private Channels
Channel Messages:
Newer Content: Target the dedicated private channel mailbox linked to the parent Microsoft 365 Group.
*-> Historical Content: Target the individual Exchange Online mailboxes of all members belonging to that private channel.
Shared Files: Target the distinct SharePoint site collection automatically generated specifically for that individual private channel Box 2: The Microsoft SharePint Online site of Team1 Shared Channels Channel Messages: Target the primary Exchange Online mailbox of the parent team (the host Microsoft 365 Group mailbox). Individual system mailboxes for shared channels cannot be targeted independently.
Shared Files: Target the distinct SharePoint site collection automatically provisioned for that specific shared channel.
Reference:
https://learn.microsoft.com/en-us/purview/edisc-search-teams