WD backup complains of not enough space on 3TB Passport

Just bought my first 3TB Passport to backup my photos from a 3TB HD. WD backup program complains of not enough space even though there is only about 2.5TB of photos to be backed up.

Hello,

Please make sure the drive has enough free space in order to backup 2.5TB of data into it. If it is not a free space issue then I recommend you uninstall and reinstall WD Backup.

It’s a brand-new 3TB Passport. I copied the files to it manually from the drive I wanted backed up and it all fit fine. There is another 3TB passport on it’s way and I will try to use that one.

Thanks for the reply.