metadata.db is not a large file.
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.
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.
& 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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