100%. Tens of thousands of nodes (the exact number isn't known because they're over TOR) each with a complete copy of the blockchain.

I researched a certain DAG - directed acrylic graph - chain and in addition to many many issues this is one of them. The developers themselves have said that individual nodes would only have 3 days worth of history. That's because the amount of chain data is so large it would be continually shed... too large for home-non commerical nodes to keep.

Bitcoin it's always all there from the beginning.