Ruminations on cross-cloud library management Background I have a set of different devices across which I need to sync my library (described in an earlier post). Ideally this should be a lazy synchronization mechanism and be as general as possible. Constraints calibre should never be modifying the files while they are being synced, not only because it creates and removes a lot of temporary files and folders which will cause churn, but also because it actually locks files during modification a...