This error happens in Plesk when you try to make a backup from the web interface.

The cause is that Plesk can´t write in the temporal folder specified to storage backups because the owner is root:

ll /var/lib/psa/dumps/
drwx------ 9 root root 4096 Apr 1 14:21 tmp

To fix this change the ownership of the folder:

chown psaadm.psaadm /var/lib/psa/dumps/tmp

Now you can do backups in Plesk.

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