there are some 'decentralized' cloud storage services I stumbled upon recently when researching along similar lines to your question. I don't have any particular offering to recommend but the ecosystem players are nicely summarized here: https://www.gemini.com/cryptopedia/crypto-cloud-storage-dece...
Thanks for the suggestion, but not looking for blockchain type of storage, that's a can of worms in terms of security and availability/reliability in my opinion