I just put my image archive for the last 20 years on a single 100 GB BDXL disc, around 11 000 files. Granted these are mostly cell phone photos, not RAW or anything like that. I did the same with documents on an M-Disc DVD and email mbox-archive on another M-Disc DVD. All disks with copies of dvdisaster and a separate slimline usb-c drive. Chucked offsite in a fire proof safe. I think M-Discs or any HTL bluray a fine supplement to an otherwise comprehensive backup strategy.
I get the sense Android is going the way of MacOS and Darwin. At some point Google will release something non-free end users experience as an absolutely integral part of OS, and it won't be possible to continue as an equivalent alternative. AOSP will still be free and underlying the whole thing, but slowly rot away as anything more than a code base.
I also use backrest/restic on my NAS, but I went with a Hetzner StorageBox instead, a little cheaper for 1TB (I pay 5USD monthly including VAT, billed monthly too).
Fwiw, biometric login works fine for me. You need to install something like DuckDuckGo or Brave and set as default browser during setup. And only Google Password manager works for storing the passkey.