LiGHTROOM: Separate subdirectories for previews of different sizes

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I back up my Lightroom catalog including previews. I'd love to never back up any 1:1 previews, but right now there's no good way to differentiate them from the others because they're all mixed together in the same previews directory. If Lightroom stored 1:1 previews in a separate subdirectory I could exclude that in my backup software.
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Steven Grimm

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Posted 5 years ago

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Rob Cole

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All preview sizes are stored in the same file (not just the same directory).

What you are proposing would require significant re-writing of the preview subsystem (it's not just a directory thang).

Since this is unlikely to happen soon, if ever, it may be worth considering a plan B.

Rob
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Steven Grimm

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Fair enough; I couldn't find any documentation anywhere describing how previews were actually stored. I'll continue to back up the 1:1s, I guess. Thanks for the quick reply.
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Rob Cole

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Yeah, it's not documented.

And I can see why the obvious solution: discard 1:1s before backup may not be desirable.

Out of curiosity, why are you backing up previews? (most people don't, except when doing full system backup I mean).
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Steven Grimm

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I do a lot of long-term travel with just my laptop, and sometimes people I meet are interested in seeing some of my photos. I don't have enough disk space to carry years of RAWs around with me, but standard-size previews of my entire archive will fit no problem and that's good enough for this kind of casual use. By backing up my previews, I can continue doing impromptu slideshows for people even if I have to replace my gear for whatever reason (theft, etc.) -- rather than laboriously downloading batch after batch of huge RAWs and regenerating previews from scratch, I can just restore my preview directory and be back in business.

Kind of a corner use case, I admit.
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Rob Cole

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Have you checked out Lr5's smart previews? (may be just what the doctor ordered for you).
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Steven Grimm

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That's the feature I'm most excited about in Lr5!