Alan321 Offline Upload & Sell: Off
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You could back up your previews occasionally if space is not an issue, but since they take only time to be rebuilt from scratch whenever needed it is not an essential thing to back up. In fact, as part of a routine backup process they just get in the way.
I suppose we can only wonder what went wrong. Perhaps the computer was shut down or powered down before changes to the previews had finished being written to the drive. Windows lets you enable or disable write caching for each drive to prevent such glitches. Unless you have an uninterruptable power supply or use a laptop with a healthy battery, any mains-powered drives are at risk in the even of a power failure.
Or maybe it was just a random glitch that would happen regardless of power supply - such things really do happen.
I like to keep 1:1 previews because they speed things up in the Lr Library module. However, I either discard all of the obvious crap before importing the rest into Lr, or else I import everything into Lr with minimal previews, discard the crap and then build 1:1 previews. Either way prevents wasting too much time on 1:1 previews of rubbish. Of course whether you have 1:1 previews or not, opening an image in the Develop module re-converts raw files and largely bypasses the preview system.
- Alan
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