The importance of backing up your EndNote library cannot be overstated. EndNote can facilitate many of your reference and citation management tasks, but this is true only if you protect the files that constitute your EndNote library: the ".enl" file and the "*. data folder.
For example, let's say you create an EndNote library called "Cognitive Dissonance." Your library would consist of a file called "Cognitive Dissonance.enl" and an associated data folder called "Cognitive Dissonance.data"
Both the ".enl" file and the ".data" must be backed up to protect your EndNote library. Preferably you regularly back up this file and folder to a flash drive, external disk, the cloud or some other device or location apart from the computer on which installed EndNote.
There are two EndNote backup functions (illustrated in the video links in the box below):
Both backup functions will make backup copies of your ".enl" file and your ".data" folder. The "Compressed Library (.enlx)" function is preferred because of its versatility and efficiency.
You also can use Windows Explorer to make your backup copies, but you must remember to copy both the ".enl" file and the ".data" folder.
Neither of the following videos uses the most recent version (version X7) of EndNote. However, the backup process is essentially the same for the most recent versions of EndNote. Both videos cover the two EndNote backup functions:
1) Save a Copy
2) Compressed Library