@filipniziol 

We are both right, but to be specific, I was referring VACUUM command - so effectively, if You run it on a table, by default, the VACUUM command will delete data files older than 7 days from the storage that are no longer referenced by the delta table's transaction log.

So, to make it clear:

delta.deletedFileRetentionDuration - default 7 days, deletes data older than specified retention period - triggered by VACUUM command;

delta.logRetentionDuration - default 30 days, removes logs older than retention period while overwriting the checkpoint file - build-in mechanism, does not need VACUUM;