I was having problems with backups timing out, most likely due to their size. The finder tables are >4GB in size, and I'm uploading to S3 over only a 10mbit link. For this reason, backups are performed by cron using the akeeba-backup.php command-line script.
I read a previous thread about enabling JPS encryption for the archives. It appears now backups are failing with "Could not decrypt settings for profile #1". I have created a key to use for backups and stored it in the configuration, but the error message says the command-line backup can't support encrypted backups. I've even tried disabling the JPS encryption, and it still reports the same error message.
This is on fedora29 with mcrypt installed.
# rpm -qva|grep mcrypt mcrypt-2.6.8-19.fc27.x86_64 libmcrypt-2.5.8-22.fc28.x86_64 php-pecl-mcrypt-1.0.1-3.fc28.x86_64
Akeeba Backup CLI 6.4.2 (2019-03-14) Copyright (c) 2006-2019 Akeeba Ltd / Nicholas K. Dionysopoulos ------------------------------------------------------------------------------- Akeeba Backup is Free Software, distributed under the terms of the GNU General Public License version 3 or, at your option, any later version. This program comes with ABSOLUTELY NO WARRANTY as per sections 15 & 16 of the license. See http://www.gnu.org/licenses/gpl-3.0.html for details. ------------------------------------------------------------------------------- You are using Joomla! 3.8.6 on PHP 7.2.15 (cli) Starting a new backup with the following parameters: Profile ID 1 Description "Command-line backup" Current memory usage: 3.4 MB Unsetting time limit restrictions. Site paths determined by this script: JPATH_BASE : /var/www/www.mysite.com-443/html JPATH_ADMINISTRATOR : /var/www/www.mysite.com-443/html/administrator An error has occurred: Could not decrypt settings for profile #1 The settings for backup profile #1 are stored encrypted in your database. However, PHP 7.2.15 (cli) on your server -which you use to run this backup script- does not support encrypted settings. Since the settings cannot be read the backup has failed. The detected errors are: The encryption key has changed Since your encryption key has changed you have permanently lost all your encrypted settings. Please reconfigure the backup profile and retry taking a backup. There is nothing else you can do.