NOOK for Windows 8 easily lets you archive books, magazines, newspapers and comics from your library.
1. From the Library screen, tap and hold on the title to be archived, then drag it in a downward motion (a mark will appear for the item you selected).
2. Options appear to see the full version available (when viewing a sample), view details, download, archive, or sync. Tap or click on "Archive" to archive the book.
Please note: Archiving an item removes the file from your device, and moves the title into the Archive folder in your NOOK Library in the NOOK Cloud. You can unarchive the item if you want to re-download it to your device.