It is important to regularly backup your EndNote Library especially if you plan to make changes e.g. alter your preferences (sync, reference types etc.), globally edit or annotate a particular field, upgrade your EndNote software etc.
Store a copy on the University network (your H: drive). EndNote advises NOT to back up to a cloud environment, such as Dropbox or Google Drive as your EndNote Library may become corrupt or damaged.
Each library is made up of a file with the extension .ENL (your main database) plus a corresponding .DATA folder (this includies your PDFs, other attachments, figures, groups etc). Both files must be backed up.
There are several backup methods. It can take some time to process a backup so be patient.
The Compressed Library command saves your library and .data folder a compressed .enlx file. This is the recommended method of backing up as you only have one file to hand.e. It is also useful if you don't have a lot of storage space or if you wish to send a copy of your Library to a colleague.
Restoring a Compressed Library File
The EndNote Save a Copy command creates a .ENL file as well as a .DATA folder for your backup library copy, including your PDFs etc.
Save a Copy does not compress your files. Make sure you have sufficient storage space if your Library contains large numbers of references and PDFs. Alternatively use the Compressed Library command.
If you regularly sync your EndNote Desktop Library with your EndNote Online account this may provide a limited backup to your basic references.
Be aware that EndNote Online does not have the full functionality of EndNote Desktop and if this is your only backup you may lose your Group Structure, Customised fields and other features. It is best to take regular backups using the Save a Copy or Compressed Library functions.
For more information on synchronising your Library see the EndNote Mini Guide and EndNote Online guide at http://libguides.stir.ac.uk/endnote