The Clipboard is a simple way to copy existing Blocks and paste them around a site
Adding a block to your Clipboard
Put your page in Edit mode, click on the block you would like to copy to your clipboard, click Copy to Clipboard.
Placing a Block from the Clipboard
Put the page in edit mode. Open the block add pane by clicking the plus sign on the top bar. Click the downard arrow next to the word "Blocks" and select "Clipboard".