Backup finishes with the warning: /usr/lib/plesk-9.0/sw-tar: No such file or directory

Symptoms

• In an attempt to create a backup in Plesk > Tools & Settings > Backup Manager, it finishes with the following warning:

  PLESK_INFO: Warning: server "server"
  Not all the data was backed up into /var/lib/psa/dumps successfully. Total space: 49.00 GB; Available space: 39.00 GB; Mounted on: /. sh: /usr/lib/plesk-9.0/sw-tar: No such file or directory

  ---

  CONFIG_TEXT: Database exampledb, type mysql is skipped from backup due to error: Can't use string ("") as an ARRAY ref while "strict refs" in use at /opt/psa/PMM/agents/shared/HelpFuncs.pm line 714.

• The /usr/lib/plesk-9.0/sw-tar file does not exist on the server.

• The server was recently upgraded from Debian 8 to Debian 9.

Cause

The Plesk bug with ID #PPPM-11606, that will be fixed in the next product updates.

Resolution

Until the bug will be fixed, apply the following workaround:

1. Log into the server via SSH.
2. Create the backup of /etc/psa/psa.conf file:

   # cp -pr /etc/psa/psa.conf /etc/psa/psa.conf.back

3. Execute the command below to set the correct value for the TAR_BIN variable :

   # sed -i 's/TAR_BIN \/usr\/lib\/plesk-9.0\/sw-tar/TAR_BIN \/bin\/tar/g' /etc/psa/psa.conf