Issue Backup to FTPS Server - some work and some fail

[Scott.B]

Server operating system version

CentOS 7.9

Plesk version and microupdate number

Plesk Obsidian 18.0.75

We have been having the backups for our domains and server working for well over a year without issue. They backup to a FTP Server we have. Now all of a sudden in the last 2 weeks backups for certain domains and our full server backup stopped working, while backups for some domains work fine.

For the domain backups that are failing, the following error is reported

Error:
Unable to create the remote backup: Transport error: Unable to resume an interrupted upload: Requested data is out of the cached data (current cache size: 5 MB, cached data size: 5 MB, required data size: 18340 MB): The connectivity problem: (28) Timeout was reached: The last FTP request: STOR backup_roncosafety.com_2601100205.tar: The last FTP response: 150 Opening data channel for file upload to server of "/backup_roncosafety.com_2601100205.tar"
Warning:
Unable to delete the incomplete remote backup. Error: Failed to exec pmm-ras: Exit code: 126: Transport error: Unable to delete the specified file: Curl error: (21) Quote command returned error: The last FTP request: DELE backup_roncosafety.com_2601100205.tar: The last FTP response: 500 Failed to delete the file

Why do some of the backups work, but others all give the error above?

 

[scsa20]

Refer to https://support.plesk.com/hc/en-us/...-fails-Unable-to-resume-an-interrupted-upload

Basically you'll want to add streamCacheSize = 1024 under [pmm]. You can do it via SSH was the article says or install the Panel.ini extension and use that. Adjust 1024 to something higher (like 20000).

 

[Scott.B]

So I used the Panel.ini editor within Plesk and added streamCacheSize = 20480 under the PMM section.

Once I did that I was no longer able to access the Backup Manager area for any domain and got the following page instead. The moment I removed the newly added directive to Panel.ini file, I was able to access the Backup Manager. I do not know if the backups will work after adding the directive, because as noted I cannot access the Backup Manager to trigger a backup.