It is essential that your Endnote Library is stored on your local hard drive. Do not store it on cloud storage services like OneDrive, Dropbox, or Google Drive. These services may corrupt your Endnote Library.
See more information and guidance on moving EndNote to your local drive at: http://stir.ac.uk/7e7
Create back-ups frequently using the Compressed Library option (File > Compressed Library).
Store your back-up library in OneDrive and restore it to your hard drive if you need to at any time.
If you work between different devices you must synchronise your data via EndNote Online. If regularly synchronised, EndNote Online can provide an additonal backup of your Library.
If you are working with EndNote on multiple devices it is crucial that you keep both versions up to date and you have a backup in case anything goes wrong.
If you make changes to your library always take a backup and sync before closing it. When you change to your other device always sync when you open your Library (and again, take a backup and sync when you are finished making changes).
A strength of EndNote is being able to use it on the desktop. This means it has better ability to handle large datasets and process quickly.
However, if you need to work on multiple machines e.g. a University computer in the office and a personal laptop at home, you need to synchronise the changes between your computers and EndNote Online in order to keep everything up to date.
Device 1
Device 2