I keep my data in the cloud, with a local 1:1 mirror of which i keep a 3-2-1 backup (local + cloud).
Besides that i keep USB drives and M-disc archives of photos, identical sets stored in geographically separate locations. Optical media should be resilient to most natural phenomenon like flooding and solar flares. They're not resilient to fires, which is why i keep duplicate sets.
I keep everything in the cloud as well. Documents are either in GDrive / Dropbox and photos are in iCloud. For sensitive documents I created an encrypted disk image that I store in Dropbox and mount when I need access to it, which is pretty infrequent. I periodically backup content to a NAS and I backup the NAS to B2.
I use Insync since this seems to be one of the few softwares that works on both Windows as well as a Linux box. But it has crazy privacy concerns. I have been able to view documents uploaded on someone else's account on my Insync app! I have no idea how many folks have seen my documents/data.
Take a look at Cryptomator. If offers transparent encryption across windows, Linux and MacOS. Desktop clients are free, iOS/android costs a one time fee.
Besides that i keep USB drives and M-disc archives of photos, identical sets stored in geographically separate locations. Optical media should be resilient to most natural phenomenon like flooding and solar flares. They're not resilient to fires, which is why i keep duplicate sets.