I have lots of Google Drive storage that is free but almost never used. I basically don't trust any of the big cloud storage providers and would only store files that are public or use very strong encryption. I have come up with some alternatives. One is to set up private storage on a VPS. It doesn't take much of a VPS to just do FTP and for a few dollars a year you could get a VPS with lots of storage and not much CPU and memory. Connect via SFTP and you can set up backups to another VPS via Rsync among other methods. The main disadvantage here is that there is limited backup security compared to a cloud storage provider but the privacy advantage is huge. The other alternative is Usenet. The same technology that is used for posting pirate files can be used for cloud storage. It is very easy to create a group that won't be indexed by usenet web indexers and thus invisible to the web and only accessible to a newsreader on a paid usenet account. A little obfuscation would make that group hard to find even with a reader unless you knew the exact name. I would use very strong encryption for anything uploaded this way, a couple layers of it at least. File retention on Usenet servers is around 3 years at bare minimum and some providers have much more. The file will be replicated to every other Usenet server so the backup security will be excellent. If you use the standard yEnc protocol and add some signature verification in the encrypted files, you will be sure to be downloading what you uploaded.