Support intro
Sorry to hear you’re facing problems 
help.nextcloud.com is for home/non-enterprise users. If you’re running a business, paid support can be accessed via portal.nextcloud.com where we can ensure your business keeps running smoothly.
In order to help you as quickly as possible, before clicking Create Topic please provide as much of the below as you can. Feel free to use a pastebin service for logs, otherwise either indent short log examples with four spaces:
example
Or for longer, use three backticks above and below the code snippet:
longer
example
here
Some or all of the below information will be requested if it isn’t supplied; for fastest response please provide as much as you can 
Nextcloud version (eg, 20.0.5): 24.0.4
Operating system and version (eg, Ubuntu 20.04): Synology DSM 7.2-64570
Apache or nginx version (eg, Apache 2.4.25): apache2
PHP version (eg, 7.4): 8.0.22
The issue you are facing:
Unfortunately I had a system crash but managed to restore all raw data from the hard-drives. Now I want to restore the hole server including nextcloud with mariaDB. Nextcloud and mariaDB are running in two separated docker containers. To set ist up again I used the same NC and mariaDB versions as before. Now the question is how to restore the database as well as all nextcloud data and user configurations with all accounts used before. Just a copy does not work of course…
Is this the first time you’ve seen this error? (Y/N): Y
Steps to replicate it:
- crash the system
- restore data from hard drives
- set everything up again
The output of your Nextcloud log in Admin > Logging:
does not help here it is just a freshly installed NC
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
previous config.php (replace idtentifiable information with '...':
<?php
$CONFIG = array (
'htaccess.RewriteBase' => '/',
'memcache.local' => '\\OC\\Memcache\\APCu',
'apps_paths' =>
array (
0 =>
array (
'path' => '/var/www/html/apps',
'url' => '/apps',
'writable' => false,
),
1 =>
array (
'path' => '/var/www/html/custom_apps',
'url' => '/custom_apps',
'writable' => true,
),
),
'instanceid' => '...',
'passwordsalt' => '...',
'secret' => '...',
'trusted_domains' =>
array (
0 => '...',
1 => '...',
2 => '...',
),
'trusted_proxies' =>
array (
0 => '...',
),
'datadirectory' => '/var/www/html/data',
'dbtype' => 'mysql',
'version' => '24.0.4.1',
'overwrite.cli.url' => '...',
'overwriteprotocol' => 'https',
'dbname' => 'nextcloud',
'dbhost' => '...',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => '...',
'dbpassword' => '...',
'installed' => true,
'theme' => '',
'loglevel' => 2,
'defaultapp' => 'files',
'default_phone_region' => 'DE',
'filelocking.enable' => true,
'maintenance' => false,
'app_install_overwrite' =>
array (
0 => 'mindmap_app',
1 => 'whiteboard',
2 => 'dashboardcharts',
3 => 'shifts',
),
'mail_from_address' => '...',
'mail_smtpmode' => '...',
'mail_sendmailmode' => '...',
'mail_smtphost' => '...',
'mail_smtpport' => '...',
'mail_smtpsecure' => 'ssl',
'mail_domain' => '...',
'mail_smtpauth' => 1,
'mail_smtpname' => '...',
'mail_smtppassword' => '...',
);
Thanks in advance!
Daniel