Cannot backup a server with Dropbox Backup extension

Symptoms

• Server backup with Dropbox Backup extension fails with the following:

  CONFIG_TEXT: Failed to Execute: '/usr/local/psa/bin/pleskbackup' server --output-file='/tmp/dropboxxxaact.tar' 2>&1
  Output: Runtime error: Unknown error from pmmcli

• Running the failed command with debug enabled shows the following information:

  # /usr/local/psa/bin/pleskbackup server -vvvvv --output-file='/tmp/dropboxQAPN2v.tar' 2>&1 | grep err
  <errcode>13</errcode>
  <errmsg>Not enough free disk space to backup selected objects. At least 15326.4082643 Mbytes free disk space is required.</errmsg>
  Runtime error: Unknown error from pmmcli

Cause

Insufficient disk space for creating a backup. Bug created for the issue with vague initial error reporting: #PPPM-9509.

Resolution

To stop the error from appearing, it is necessary to increase the available disk space for the location where backups are stored before they are uploaded to Dropbox. 

By default, all backup data is stored in the directory /var/lib/psa/dumps.

The actual path can be determined by executing the command below:

# cat /etc/psa/psa.conf | grep -w DUMP_D