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I tried and used Lightroom for a while. I didn't want to keep paying Adobe so I tried to switch to darktable[0].
Maybe I'll give lightroom another try.
This sort of thing scares me. It's why I started running consistency checks on my important archives (like my photo library), which I keep backed up in multiple places. We tend to think that in a digital world bits are just bits and do not get corrupted — which is decidedly untrue.
I wrote my own consistency checker, as I wasn't happy with what was out there. I wanted it to be simple, and maintainable in the long term (>10 years horizon). See https://github.com/jwr/ccheck if you need something like this. I now update my checksums regularly and check for corruption.
2. When the card is full, images are copied in the field on the USB drive. I imagine the user has a 128G SD card and multiple photo sessions will exhaust internal storage quickly, especially on a mac with 256G-512G SSD, hence an external drive. APFS may be used instead of FAT but then the drive won’t be readable on Windows or Linux. Mac doesn’t allow writes to an NTFS filesystem unless you buy a 3rd party driver of unknown reliability. I guess one can try to combine your linked guide with https://github.com/spl/zfs-on-mac to get ZFS on a USB drive but all of that is done at your own risk.
I am writing a Rust CLI program for managing my backups:
https://github.com/mleonhard/deduposaur
I tend to end up with multiple copies of photos and other docs: SD card, laptop, backup drives, and USB thumb drives. Deduposaur helps me to move files into my latest backup drive. It flags duplicates, modified files, and files that I previously deleted. It also checks each file's SHA-256 digest to detect corruption.
The program is usable but needs some usability improvements and more tests. The license is Apache 2.0. I am happy to receive problem reports, feature requests, and pull requests.