This is a plugin that was made for Cubehamster, to make backups easily.
It copies all the blocks in a designated area next to the said area, and then teleports you, and moves the area to the new zone, so you can right click to continue copying without having to reselect the zone each time you backup it.
Place a block of diamong and a gold block at the corners of the area you want to backup, then click on them with a wood sword.
Click to the direction where you want the zone you selected to be copied.
Doesn't causes a block update, automatically displaces the backup zone.
If it starts copying regardless of where you are looking, try moving a bit and it'll fix the bug by itself.