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?
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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.
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.