Acronis error on Plesk server: Unable to read or parse metadata: Can not get content of the metadata.json

Symptoms

• On Acronis extension, unable to click on a backup, with the error:

  PLESK_ERROR: An error has occurred. Please try again later or contact your administrator.

  

• With debug enabled, panel.ini shows the following error:

  CONFIG_TEXT: [25-May-2024 16:35:08 Europe/Madrid] PHP Warning: file_get_contents(/mnt/Acronis/c999dec7-10000000002_0_17000000000_9/opt/psa/var/modules/acronis-backup/metadata.json): Failed to open stream: No such file or directory in /opt/psa/admin/plib/modules/acronis-backup/library/Common/Lib/Helpers/Utils.php on line 28
  [2024-05-25 16:35:08.024] 3155563:6651f71be80c8 ERR [extension/acronis-backup] Unable to read or parse metadata: Can not get content of the "/mnt/Acronis/c999dec7-10000000002_0_17000000000_9/opt/psa/var/modules/acronis-backup/metadata.json"

Cause

Acronis internal bug ABR-384180.

Resolution

1. Connect to the server via SSH

2. Go to the folder where file needs to be patched:

   # cd /var/lib/Acronis/AgentCommData/

3. Make a backup of the file that's about to be patched:

   # cp -a post-capture-data.sh{,.bak}

4. Edit file post-capture-data.sh and comment lines 30 and 31:

   CONFIG_TEXT: echo "$(date -Ins) - Removing file with metadata ..." >> "$LOGFILE"
   plesk bin extension --exec $EXTENSION_ID remove-meta.php

   It should look like this:

   CONFIG_TEXT: #echo "$(date -Ins) - Removing file with metadata ..." >> "$LOGFILE"
   #plesk bin extension --exec $EXTENSION_ID remove-meta.php' > diff.patch