I attempted to start a Time Machine backup but the backup failed due to insufficient space. I now have a useless 60 GB .inProgress file that's eating into my already limited storage space.
For a seemingly easily-achieved problem, there are few resources online for this. A pre-Catalina article from 2018 suggests using
tmutil delete /path, as do these Ask Different answers. All of these answers are also pre-Catalina.*
With such consensus of answers I tried
sudo tmutil /path/backup.inProgress but received a return message of "Invalid deletion target (error 22)" and "Total Deleted: 0B"
$ sudo tmutil delete /Volumes/XXXX/Backups.backupdb/XXXX/2020-09-30-004400.inProgress Password: /Volumes/XXXX/Backups.backupdb/XXXX/2020-09-30-004400.inProgress: Invalid deletion target (error 22) Total deleted: 0B
Also, when I run
tmutil listbackups Terminal only prints completed backups (as the manual indicates should be the case).
How can I safely delete the 60 GB .inProgress file?
*This answer suggests simply dragging the .inProgress file into the Trash – though from personal experience I know this is wrong and leads to problems – namely a perpetually stuck Time Machine and an impossible to empty Trash.