Full Plesk backup is created instead of incremental one

Plesk for Linux kb: bug ABT: Group A

Applicable to:

Full Plesk backup is created instead of an incremental one or backup task fails with the following error:

CONFIG_TEXT: Unable to validate the remote backup. It may not be restored. Error: Failed to exec pmm-ras: Exit code: 1: basic_string::_M_create

Product issue:

#PPPM-12112 "After updating to Plesk Obsidian 18.0.28, a full server backup is no longer erroneously created instead of an incremental one when the base backup exists and it is valid."
Fixed in:
- Plesk Obsidian 06 July 2020

Please consider updating your server:

If update not possible for some reason, apply a custom fix following the steps below:

For CentOS 7

Back up the existing pmm-ras utility

# cp /usr/local/psa/admin/sbin/pmm-ras /usr/local/psa/admin/sbin/pmm-ras.bk
Download the fixed file:

# wget https://plesk.zendesk.com/hc/article_attachments/360013662060/pmm-ras-18.0.28-bcos7x64.zip
Unzip it:

# unzip pmm-ras-18.0.28-bcos7x64.zip
Place the fixed file instead of the existing one:

# cp pmm-ras /usr/local/psa/admin/sbin/pmm-ras

For Ubuntu 18.04

Back up the existing pmm-ras utility

# cp /usr/local/psa/admin/sbin/pmm-ras /usr/local/psa/admin/sbin/pmm-ras.bk
Download the fixed file:

# wget https://plesk.zendesk.com/hc/article_attachments/360013662080/pmm-ras-18.0.28-ubt1804x64.zip
Unzip it:

# unzip pmm-ras-18.0.28-ubt1804x64.zip
Place the fixed file instead of the existing one:

# cp pmm-ras /usr/local/psa/admin/sbin/pmm-ras

For Debian 9

Back up the existing pmm-ras utility:

# cp /usr/local/psa/admin/sbin/pmm-ras /usr/local/psa/admin/sbin/pmm-ras.bk
Download the fixed file:

# wget https://plesk.zendesk.com/hc/article_attachments/360014136740/pmm-ras-18.0.28-deb90x64.zip
Unzip it:

# unzip pmm-ras-18.0.28-deb90x64.zip
Place the fixed file instead of the existing one:

# cp pmm-ras /usr/local/psa/admin/sbin/pmm-ras