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Unless OneDrive silently corrupts your files upon upload: https://github.com/OneDrive/onedrive-api-docs/issues/1577
I also recently found a use for my rpi 3b as well. I bought a $30 USB SDR Receiver [0] and started collecting ADS-B [1] data and uploading to ADS-B Exchange [2]. I have been collecting flight data for aircraft flying overhead for a few weeks now and it is super interesting to see what kinds of aircraft are flying around me. There are a lot more military planes that I would've expected.
[0] https://www.adafruit.com/product/1497
[1] https://www.faa.gov/air_traffic/technology/adsb
[2] https://www.adsbexchange.com/
I just set up one to run https://github.com/dmunozv04/iSponsorBlockTV, which is my new favorite thing ever! All the youtube videos playing out of my Apple TV automatically skip the sponsored segments now!
It also runs HomeBridge which also runs rock solid. I can now control my mini-split and pool equipment straight from Apple Home, which is way faster and easier than the crappy apps that they came with.
In addition to the other helpful suggestions you’ve received, look into using Log2Ram. It does what it sounds like, puts log writes in ram and then writes them to disk on a slower cadence that doesn’t work your SD card that much.
https://github.com/azlux/log2ram
I don't think you can run ZFS on any Pi older than a 4 (even then only with non-base-model RAM). I also like and use ZFS, but I run BTRFS on all my Pis and it's been solid for years on end, whether SD card or SSD.
Benefits in this context would include checksumming, compression, snapshot + incremental send, built-in kernel support (which is why I use it as root filesystem even on machines that use ZFS for data integrity), very flexible RAID1 setups, the option for DUP data on an SDcard (still unclear to me if this would improve odds of recovery in case or error or just increase the odds of corruption in the first place).
ZFS may be king in many / most scenerios, but I've been very happy with my Pi on BTRFS root that I've used with Ubuntu server, Raspbian, and now NixOS[0], on Pi 2/3/4.
[0]: https://github.com/n8henrie/nixos-btrfs-pi