Backing-up your library
There are two options for backing up your library: compressing it and storing it on a hard drive, or creating an EndNote Online account and syncing with that.
Using EndNote Online also means you can sync and access your library from different devices, including iPads, and share it with up to 100 other people.
Note: Do not store your normal library on Dropbox, Google Drive, or other cloud-based services as it very likely to get corrupted that way.
However, if you compress it to make a back-up, you can keep that on the cloud-based service.
If you have issues with syncing, please read these instructions on how to reset the sync. This will let you clear out what is on EndNote Online, and use your EndNote Desktop library as the source.