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Sorry to hear you’re facing problems 
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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
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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): 21.0.1
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04.2
Apache or nginx version (eg, Apache 2.4.25): Apache 2.4.41
PHP version (eg, 7.4): 7.4.3
The issue you are facing:
I noticed today that Nextcloud had deleted over 300GB of video files. I have set up the desktop client to sync a specific folder and I have ignored a sub-folder in this. I have been running it this way for about a year now.
For some reason it seems that the NC client tried to sync this folder, I say this because I can see the folder in the web-interface but it is empty. Somehow all the files are deleted and I cannot find them anywhere locally or on the server.
I have tried to use the TestDisk utility to recover the files but it was not possible
Is this the first time you’ve seen this error? (Y/N):
Yes
Steps to replicate it:
- Do not know how to replicate this
The output of your Nextcloud log in Admin > Logging:
{"reqId":"gd3qy6QLXc3Cw7PwORX7","level":3,"time":"2021-04-19T19:13:25+00:00","remoteAddr":"185.125.169.27","user":"bigboss","app":"no app in context","method":"PUT","url":"/remote.php/dav/uploads/bigboss/3596350639/0000000000000055","message":{"Exception":"Sabre\\DAV\\Exception\\BadRequest","Message":"Expected filesize of 53643174 bytes but read (from Nextcloud client) and wrote (to Nextcloud storage) 12402688 bytes. Could either be a network problem on the sending side or a problem writing to the storage on the server side.","Code":0,"Trace":[{"file":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/Directory.php","line":156,"function":"put","class":"OCA\\DAV\\Connector\\Sabre\\File","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Upload/UploadFolder.php","line":46,"function":"createFile","class":"OCA\\DAV\\Connector\\Sabre\\Directory","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":1098,"function":"createFile","class":"OCA\\DAV\\Upload\\UploadFolder","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/CorePlugin.php","line":504,"function":"createFile","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/event/lib/WildcardEmitterTrait.php","line":89,"function":"httpPut","class":"Sabre\\DAV\\CorePlugin","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":472,"function":"emit","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":253,"function":"invokeMethod","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/3rdparty/sabre/dav/lib/DAV/Server.php","line":321,"function":"start","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/lib/Server.php","line":332,"function":"exec","class":"Sabre\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/apps/dav/appinfo/v2/remote.php","line":35,"function":"exec","class":"OCA\\DAV\\Server","type":"->"},{"file":"/var/www/nextcloud/remote.php","line":167,"args":["/var/www/nextcloud/apps/dav/appinfo/v2/remote.php"],"function":"require_once"}],"File":"/var/www/nextcloud/apps/dav/lib/Connector/Sabre/File.php","Line":246,"CustomMessage":"--"},"userAgent":"Mozilla/5.0 (Linux) mirall/3.2.0-20210410.072919.14fbf1b10-1.0~focal1 (Nextcloud, ubuntu-5.8.0-50-generic ClientArchitecture: x86_64 OsArchitecture: x86_64)","version":"21.0.1.1","id":"608843b790737"}
The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):
<?php
$CONFIG = array (
'instanceid' => 'xxxxxxxxxx',
'passwordsalt' => 'xxxxxxxx',
'secret' => 'xxxxxxxxxxxx',
'trusted_domains' =>
array (
0 => 'xxxxxxxxx',
1 => 'xxxxxxxxxx',
2 => 'xxxxxxxxx',
3 => 'localhost',
),
'datadirectory' => '/mnt/cloud/data',
'dbtype' => 'mysql',
'version' => '21.0.1.1',
'overwrite.cli.url' => 'xxxxxxxx',
'dbname' => 'nextcloud',
'dbhost' => 'localhost',
'dbport' => '',
'dbtableprefix' => 'oc_',
'mysql.utf8mb4' => true,
'dbuser' => 'xxxxxxx',
'dbpassword' => 'xxxxxxx',
'installed' => true,
'memcache.distributed' => '\\OC\\Memcache\\Redis',
'memcache.local' => '\\OC\\Memcache\\Redis',
'memcache.locking' => '\\OC\\Memcache\\Redis',
'redis' =>
array (
'host' => 'localhost',
'port' => 6379,
),
'maintenance' => false,
'theme' => '',
'loglevel' => 2,
'updater.release.channel' => 'stable',
'default_phone_region' => 'xx',
);
The output of your Apache/nginx/system log in /var/log/____:
[Tue Apr 27 00:00:01.235935 2021] [mpm_prefork:notice] [pid 980] AH00163: Apache/2.4.41 (Ubuntu) OpenSSL/1.1.1f configured -- resuming normal operations
[Tue Apr 27 00:00:01.235947 2021] [core:notice] [pid 980] AH00094: Command line: '/usr/sbin/apache2'
