by JF J.
To find and delete quickly backup files, you could just use the command to list first. Beeing in you dataroot folder.
sudo find . -type d -name backupdata -print
And when you are sure, delete:
sudo find . -type d -name backupdata -print | xargs /bin/rm -rf
It will delete all backupdata folder. We did this before upgrading from 1.9 to 2.2, we had 350Gb og backup data.
or to delete only the files:
find . -type f -name backup-* -print | xargs /bin/rm -f