A Plesk backup task fails in Plesk: Wrote only 4096 of 10240 bytes

Symptoms

A Plesk backup task fails with a lot of errors like below (for files, logs, statistics, database dumps, etc.):

PLESK_WARN: Subscription “example.com”
Unable to back up files from
/var/www/vhosts/example.com owned by system user. Error: Failed to create archive: backup_user-data_2002050759.tgz 0
Repository error: Unable to pack /var/www/vhosts/arioland-msh.com:
/usr/lib64/plesk-9.0/sw-tar: -: Wrote only 4096 of 10240 bytes
/usr/lib64/plesk-9.0/sw-tar: Error is not recoverable: exiting now

Cause

The files /usr/bin/pigz and /usr/bin/unpigz are corrupted.

Resolution

Apply the following solution for CentOS 7:

Note: For other operating systems, contact Plesk Technical Support.

1. Connect to the Plesk server via SSH.

2. Download the files:

   # wget https://plesk.zendesk.com/hc/article_attachments/360008716799/pigz_centos7.gz

3. Unzip the downloaded files:

   # gunzip pigz_centos7.gz

4. Create a backup of the original files:

   # mv /usr/bin/pigz /usr/bin/pigz.orig

   # mv /usr/bin/unpigz /usr/bin/unpigz.orig

5. Place downloaded files instead of original ones:

   # cp pigz_centos7 /usr/bin/pigz

   # mv unpigz_centos7 /usr/bin/unpigz

6. Grant the required permissions:

   # chmod 755 /usr/bin/pigz

   # chmod 755 /usr/bin/unpigz