Deleted True Image backups from external drive without having Acronis software any more
I used Acronis for years, but I now have a new iMac OS High Sierra. I would prefer to use the in-built Time Machine back up utility, but I can't delete the backups of my old PC from the Buffalo external drive (e.g. there's no option on right click of a backup folder to delete).
My licence with Acronis has expired so I no longer have the Acronis software to help me. Can anyone advise, otherwise I'll need to get a new external drive, but I also don't want to leave all that data on an external memory?