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Originally Posted by Dopedangel
I would like calibre companion to have an in app purchase that adds the ability to compare the metadata from calibre database in my dropbox and then download the missing books and update the metadata in cc for books that have changes.
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In effect, you want the sync functionality of connecting as a wireless device, plus a library compare. The first is interesting and in theory is possible, but it requires I go with option 1 and it would not work with up-syncing is-read information. The second makes me rather nervous. I need to think about it.
It seems to me that option 3, the entire calibre library duplicated onto the device with CC able to read/use the calibre database, is a better fit for what you want. There would be no "sync" or missing books because CC would be directly using the complete library.
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It should also have the ability to set the formats to download so only epubs or the format of choice are downloaded.
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You have this today. Use CC's folder settings to allow only epub.
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The problem with this approach is that calibre companion will have to download the whole metadata.db every time it is updated unless dropbox or the cloud service of choice supports incremental changes where only the changes in the file are downloaded.
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Yes, you are right. We have no control over how the cloud service does downloads. In addition to metadata.db, the other bit of option 1, browsing, requires that cover files be downloaded.
The encouraging side is that calibre cloud must do the same thing and, for me at least, the performance is acceptable. Not good by any means, but acceptable. I hesitate to generalize because I have a gigabit internet connection, much faster than the norm.