Extend logs for SharePoint on-premsies and Online more than 90 days

Question

Is there a way to preserve the logs files for more than 90 days for SharePoint online and SharePoint on-premises and define specific site collection/s to have this extended logs?

Thanks

Answer 1

Microsoft uses the Unified Logging System (ULS) in the SharePoint Online environment. Sometimes we receive requests to share these ULS logs with customers for troubleshooting and debugging scenarios. Microsoft does not provide copies of ULS logs or any access to ULS logs from SharePoint Online.

Ref: Information about ULS log access for SharePoint Online

In the Number of days to store log files box, type the number of days (1-366) that you want logs to be kept. After this time, logs will automatically be deleted.

Ref: Configure diagnostic logging in SharePoint Server