What command line delete backup file?

Hello admin Discourse,
My website get error: 502 Bad Gateway and get notification when rebuild app:

You have less than 5GB of free space on the disk where /var/lib/docker is located. You will need more space to continue

Now, i wanna delete Backups file on Dashboad, can we delete them in Zoc7?
what command line can i do it?
Thank you!

I don’t know what a zoc7 is.

rm /var/discourse/shared/standalone/backups/default/*

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