I run a Parity node with --tracing on and --pruning archive and have done so since June of 2016. Since the Byzantium hard fork (October 16), the chain data (in this admittedly extreme case) has grown more than 125 GB. If one wishes to do what I call a "deep, full, audit level accounting", one needs the traces. It's unclear if one needs the archive from this article. If you're running tracing and archive, the chain will blow past 1TB very soon.
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