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Originally Posted by cybmole
metadata.db is not a large file.
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Mine for a 2300 book library is 7 megabytes. That is a significant download. Smaller than a book to be sure, but not free.
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the app could probably stash it and re-download it only if it's date/time stamp has changed since last time.
some inspection of tablet storage will reveal if that is what c cloud already does. I find that app to be pretty quick at getting stuff from dropbox. I am 99% sure it keeps a cache of all cover thumbnails.
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The cloud APIs all contain the ability to say "get me this if what you have is newer". The more interesting question is whether the app will do incremental downloads.
As for covers, yes, calibre cloud does keep a cache. It has a command to invalidate the cache. However, unless it ignores changes in the cloud it will be keeping covers, not thumbnails. For most people these are substantially larger than thumbs.
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the problem with adding all of calibre library to tablet is one of overall size.
my modest collection is only 2.5 Gb but I expect the real power users have much larger libraries, and won't want to commit most of a 16GB tablet to storing a copy.
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Granted. However, both DopedAngel and Kaufman have asked for auto-transfer of books in the cloud but not on the device, which implies that they do want all the books on the device. In this case, cloud sync is a distraction.
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& its gets silly to have one or more copies on local PC hard drives, plus one in a cloud, plus yet another one on each tablet.
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This I disagree with. One cannot have too many backups.