Office 365 In-Place Archiving

@ILYA KANTOROVICH , appreciate the post!

Can you clarify what you are looking for?  I checked in with some of our Exchange Online experts and they were not sure, either.

With Exchange mailbox agents, you can use retention tags to configure message-level retention based on compliance and retention policies. Retention tags control how long various messages are stored on the Exchange server

https://documentation.commvault.com/11.24/expert/98881_retention_tags_for_exchange_mailbox_agent.html

Also, we support backing up Archive Mailbox:

https://documentation.commvault.com/11.24/essential/125272_exchange_online.html

I think Ilya is talking about:

Quote: "In-Place Archiving in Exchange Server helps you regain control of your organization's messaging data by eliminating the need for personal store (.pst) files and allowing users to store messages in an archive mailbox."

Source: https://docs.microsoft.com/en-us/exchange/policy-and-compliance/in-place-archiving/in-place-archiving?view=exchserver-2019

Archive mailboxes can be backed up:

https://documentation.commvault.com/11.24/essential/125272_exchange_online.html

So if we are talking about this functionality the yes you should be able to backup the data by backing up the archive mailboxes.

I think you might be right, @Jos Meijer !

First of all, thank you @Mike Struening @Jos Meijer for your answers!

The problem is that a user allegedly kept the emails in the IN PLACE ARCHIVING folder and they disappeared from there, when I came to restore folders in the recovered list there is no IN PLACE folder. I am trying to understand why it is not backed up even though it is under his account. According to your explanation, only ARCHIVE can be backed up, but IN PLACE is not the ARCHIVE as a folder so COMMVAULT can't backup it?

Wait, just to clear things up.

The “in place archiving” is a folder within the user mailbox?
If it is an actual folder within the user mailbox then this is strange behavior, unless maybe exchange policies have been altered or filters are in place.

Also if we are talking about a folder, are you browsing latest data or a point in time?

Or are we talking about a folder in the context of a second mailbox visible for the user.
If it is an additional mailbox, then this is the archive mailbox I was referring to.

Thank you very much @Michael Woodward , that's what helped!