What is it with all these attachments draw.io generates?

[Marc Dvorschak]

We use draw.io in Confluence Data Center.

If several people edit the same diagram, it can happen that draw.io creates a new attachment: drawio-backup-title-rev-number. If it is a large and regularly edited diagram, many such backups quickly accumulate - over 2300 on one page after a year!

Is it safe to delete these backups or is there a way to delete them automatically?

[David Benson [draw.io]]

What's the draw.io version?

[Marc Dvorschak]

Hi @David Benson [draw.io] ,

it's draw.io app 14.1.0.

And thanks for the quick response.

[Marc Dvorschak]

The mysterious backups are appearing again. 
Any news on the topic? Is it safe to just delete the backup files?