Creating a New EndNote Library
In EndNote, select File → New
Select where you want to save the library
Type the name of your new library
Click the "Save" button
More Details About Libraries
Libraries have two parts: a file with the extension .enl and a folder with extension .data.
The .data folder contains file attachments, term lists, and citations.
The number of references you can have in a library is unlimited - but it is best to keep it under 100,000.
You can create any number of libraries, but you can only sync or share one of them using EndNote Online
Libraries created on a PC can be used on a Mac, and vice versa.
It is very important to periodically back up your EndNote libraries. To do this in EndNote, select File → Compressed Library (.enlx) and follow the prompts.
Storing EndNote libraries in cloud-syncing folders or keeping read-write EndNote libraries on network drives or flash drives, can corrupt the data.
The timestamped tutorials below demonstrate the steps for creating a new EndNote (20 and X9) library for Windows users.
The following video-only tutorial demonstrates how to create a copy of your library in EndNote 20 for backup purposes or offline sharing.
The following timestamped tutorial from the EndNote Training YouTube channel illustrates the steps to backing up a library in EndNote X9 after creating one.