[8fingerlouie]

It depends.

Do you use iCloud optimized storage, or do you download originals to your machine ? Kopia only backs up what it can see, and in case of iCloud optimized storage, it only backs up size optimized miniatures and not the original files.

Second, I haven’t researched this, but iPhoto used resource forks and extended attributes quite extensively for its library, and if the same is true for Apple Photos, Kopia will not pick up those, but Arq will. That was the very feature that caused me to purchase Arq all those years ago.

[qmmmur]

Interesting. I don’t optimise the storage so that’s not a huge concern but the extended attributes possibly is. Does Arq support s3 apis?

[8fingerlouie]

yes, but before you "panic", look into if it's really a problem. Kopia is a fine tool, and while it's a bit lacking in native integration, it works well, and for some things even better than Arq.

Arq wins on system integration. It supports waking the machine from sleep at backup time, keeping it awake while backing up, materializing cloud only files, and many other "nice to have" things.

Kopia however wins on efficency and speed. The same ~3TB backup (incremental) done with Kopia and Arq here finishes in 3-5 minutes with Kopia, and 45 minutes with Arq, and Kopia supports deduplication across multiple clients, meaning if you backup your family photo library from multiple locations, Kopia will only store it once.

In any case, even Apple doesn't recommend backing up Apple Photos libraries, and instead recommend exporting the photos, which is what i do with Parachute.

https://www.arqbackup.com/documentation/arq7/English.lproj/s...

[qmmmur]

Yep. I setup Parachute this morning and now backup that export using a script. Pretty easy.