Why so many data lakes turn into swamps by Mark Wilczek via @infomgmt

The majority of stored information is stale, ancient, unmodified or orphaned. Yet, most strategies are focused on volume rather than value.

I agree that quantity is not useful if the data quality and governance is not there.  I can understand the temptation to hoard data on a just in case basis, but if it is not guaranteed as quality data there is no point keeping it as you can't rely 100% on the answers and conclusions you get from that data.