Symptoms
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FTP backup creation failed with one of the following errors:
PLESK_ERROR: Error: Unable to export backup: Transport error: Unable to create the directory 'ftp://ftp.domain.tld/Backup/example.com/': Curl error: (21) Quote command returned error: Last FTP request: MKD example.com Last FTP response: 550 Cannot create a file when that file already exists.
PLESK_ERROR: Unable to create remote backup. Error: Unable to export backup: Transport error: Unable to create the directory 'ftp://203.0.113.2/backup': Curl error: (21) Quote command returned error: Last FTP request: MKD backup Last FTP response: 550 Directory already exists
PLESK_ERROR: Unable to create remote backup. Error: Unable to export backup: Transport error: Unable to create the directory 'ftp://203.0.113.2/backup': Curl error: (21) Quote command returned error: Last FTP request: MKD backup Last FTP response: 550 Can't create directory: File exists
PLESK_WARN: Unable to create remote backup, the local backup will be created. Error: Unable to export backup: Repository error: Unable to create the destination directory
PLESK_WARN: Unable to find base backup for creation of incremental one, the full backup will be created. Error: Failed to exec pmm-ras: Curl error: Unable to resume an interrupted download: (28) Timeout was reached: Last FTP request: RETR
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Use passive mode option is enabled for FTP server in Tools & Settings > Backup Manager > Remote Storage Settings
Cause
Plesk product bug with id #PPPM-11295 which will be fixed in future product updates.
Resolution
Until a fix became available, as a workaround, apply the Custom fix using the following steps:
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Create a backup for
cuBackupAgent.phpfile:# cp -ap /usr/local/psa/admin/plib/api-common/cuBackupAgent.php{,.bkp}
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Download the custom
cuBackupAgent.phpfile:# wget https://plesk.zendesk.com/hc/article_attachments/360006728119/cuBackupAgent.zip
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Unzip it and replace the original file
# unzip ./cuBackupAgent.zip
# mv ./cuBackupAgent.php /usr/local/psa/admin/plib/api-common/cuBackupAgent.php
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Connect to the server via RDP
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Download the file cuBackupAgent.zip
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Unzip the content of the file cuBackupAgent.zip
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Back up the following file
%plesk_dir%\admin\plib\api-common\cuBackupAgent.php -
Place the new
cuBackupAgent.phpextracted in Step 3 to the%plesk_dir%\admin\plib\api-common\folder.
Comments
4 comments
Great, it work !!!
Thank you for the quick fix. Helped for the domain backups. However, I have seen s slightly different error message but with the same effect:
Unable to create remote backup. Error: Unable to export backup: Transport error: Unable to create the directory 'ftps://XXX.XXX/files/EXISTINGDIRECTORY/': Curl error: (21) Quote command returned error: Last FTP request: MKD EXISTINGDIRECTORY Last FTP response: 550 Create directory operation failed.
There seems to be a difference between the remote FTP Backup Manager scripts for the domains and the plesk system. The scheduled FTP backups of plesk (tools&settings-> backup manager) were working before and not affected.
Remark: The aforementioned update is working but the directory at the remote backup system must already exists, it will not be created if not.
Replacing cuBackupAgent.php did not work for me. Backups are still failing with the "Directory already exists" error.
Hello Claus Siebeneicher and Steve
This bug was recently fixed and should be available in the next Plesk Obsidian update. The article will be updated after the fix release.
The corresponding information will be added here: https://docs.plesk.com/release-notes/obsidian/change-log/
I confirm that "550 Create directory operation failed" may also be a symptom of this bug.
In case the issue would remain the same after the update, consider submitting a support request: https://support.plesk.com/hc/en-us/articles/213608509-How-to-submit-a-request-to-Plesk-support-
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