One or more of the disks you have selected for storing backups already contain scheduled backups of {0}. You can either keep ...

One or more of the disks you have selected for storing backups already contain scheduled backups of {0}. You can either keep these backups or delete the backups by formatting the disk. (The other selected disks, which do not contain scheduled backups of this server, will be reformatted and all the existing volumes and data on the disks will be deleted.)

Do you want to keep the existing backups that are on some of the selected disks?

Disks with existing backups:
{1}