With the growing threat of large-scale cyber attacks, you should consider what would happen if your cloud storage providers are offline for an extended period of time.
Make sure you have local copies of anything you care about. Ideally, have multiple copies of important data in different locations.
My preferred media are BD-R discs, as they are non-magnetic, non-mechanical. They will last for decades if stored properly, and if you use HTL media.
https://blu-raydisc.info/licensee-list/discmanuid-licenseelist.php
Many people like NAS / RAID arrays, but be careful not to rely on them as your sole backup method. They are only truly "redundant" if you are periodically swapping out drives which get stored separately. While it may seem unlikely, the entire array could be damaged by a power surge or a drop of a few feet. Optical discs would survive both.
You also may use a cloud backup service like Backblaze. What if that goes down, and/or your ISP is knocked out?