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Question: Is it safe to take a backup of just the newer Photos.app library, or may it have some crazy dependencies into the older iPhotos library?

Background: On my 479 GB HDD,
348 GB is used by "iPhoto Library.migratedphotolibrary" and
356 GB is used by "Photos Library.photoslibrary".

That's 146 % of the total capacity, which confused me until I saw this post about hard linking. Before I discovered this I tried to take a backup of both libraries (using rsync -var) onto a disk that should have enough capacity, but then rsync reported that the target disk wasn't big enough anyway. Assumedly rsync duplicates the files. So, can I safely skip backing up the older iPhoto library?

  • As a follow up, I ended up not backing up the older iPhoto library, and so far I haven't discovered any pitfalls. – bjornte Feb 4 '16 at 10:35

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