I have a Sharepoint Online client, that when browsing for a restore recently I saw that there was a lot of data simply not in the backups that is currently in Sharepoint.
I am wondering if this is because previously the Plan was set to Received/Creation Time (this is no longer an option for Plans) of 30 days, rather than Deleted Time of 30 days. It was changed to Deleted Time in Feb. This is a client that was set up back in 2021, so a lot has changed in the CommandCenter. In the Console, if you go to Policies > Configuration Policies > Exchange Policies and open a Retention Policy you can still see the Retention Mode of Deletion Time or Received Time. Prior to the Plan Change, if an item was created, backed up, and then would be aged 30 days later. My theory is that these items that ‘aged’, did not get backed up when the plan was changed to Deletion Time.
When changing a plan for M365 (Sharepoint Online in my case), does it apply retroactively to items (i.e. items that were backed up prior to the plan change)?
If it does not (which appears to be the case), how to I ingest the data that was created prior to the plan change?