Feel free to point me in a different direction if this isn't the comm for this, but I've been using a corporate cloud service (think Google Drive or OneDrive) to back up my personal files and want to move away from that.
What kind of solutions are out there so that I can back up and access my files securely from multiple platforms (Windows, mobile)? Should I think about setting up a NAS in my home?
NAS
Either go Synology for ez mode or be a true nerd and use trueNAS + your own hardware
Other nas options have higher risks of being hacked -- unless you want to keep it air gapped, which is good and smart but less convenient