Delete Partition Copy

I use Paragon Hard Disk Manager 15 Pro

I receive a warning when attempting to a delete copy of a partition on an external HD.

The external HD is one I just made copies of partition to for backups.
This external HD is not set to boot from.

After selecting to delete a backup partition on external drive I get this warning.
"Are you sure you want to delete active volume (G)?
You are about to delete volume (G) Windows8_OS. NTFS.
Your computer may no longer boot or work correctly."
Please...

Delete Partition Copy