I would never store any long-term archival data that I care about on any cloud service, not even a reputable one, not even google. And especially not one that requires a constant subscription. Been burned before. All it takes is for someone to make the business decision that deleting your stuff saves money. They don't care. Cloud is great for sharing files and co-working on stuff, not for archiving a lifetime of dive logs or precious family photos.
Local backups, and backups of backups. Luckily dive logs hardly take up any space at all, and with drives now incredibly cheap it's easy to have redundant duplicates. Keep the drives in a cheap fire safe, with an emergency duplicate at a separate location if you really care about your dive media hoard.