Strangely High S3 Egress Traffic

Nextcloud version (eg, 20.0.5): 21.0.2
Operating system and version (eg, Ubuntu 20.04): Ubuntu 20.04
Apache or nginx version (eg, Apache 2.4.25): Nginx 1.20.1
PHP version (eg, 7.4): PHP 8.0.7

Is this the first time you’ve seen this error? (Y/N): N

The output of your config.php file in /path/to/nextcloud (make sure you remove any identifiable information!):

<?php
$CONFIG = array (
  'passwordsalt' => '',
  'app.mail.imap.timeout' => 25,
  'app.mail.smtp.timeout' => 10,
  'secret' => '',
  'appcodechecker' => true,
  'trusted_domains' =>
  array (
  ),
  'datadirectory' => '/var/www/html/data',
  'dbtype' => 'mysql',
  'version' => '21.0.2.1',
  'overwrite.cli.url' => 'http://localhost',
  'dbname' => '',
  'dbhost' => '',
  'dbport' => '',
  'dbtableprefix' => '',
  'mysql.utf8mb4' => true,
  'dbuser' => '',
  'dbpassword' => '',
  'installed' => true,
  'memcache.local' => '\\OC\\Memcache\\APCu',
  'memcache.locking' => '\\OC\\Memcache\\Redis',
  'redis' =>
  array (
    'host' => 'localhost',
    'port' => 6379,
  ),
  'instanceid' => '',
  'mail_smtpmode' => 'smtp',
  'mail_smtphost' => '127.0.0.1',
  'mail_sendmailmode' => 'smtp',
  'mail_smtpport' => '25',
  'mail_domain' => '',
  'mail_from_address' => 'noreply',
  'maintenance' => false,
  'theme' => '',
  'loglevel' => 2,
  'default_phone_region' => 'AU',
  'simpleSignUpLink.shown' => false,
);

Hi,

I recently set up S3 external storage on Nextcloud as I wanted to store large files.

I’ve got about 50GB uploaded to my S3 provider at the moment, but this is spread out over less than 100 files in total.

I’m the only user on my Nextcloud instance and I don’t download from external storage very often. I don’t have any public shares either.

However, according to the dashboard, I’m seeing ~20-30GB of egress from S3 to Nextcloud a day. I’ve got 1TB of egress, but this phantom traffic is chewing through it pretty quickly.

I’ve double checked the settings and “Check for changes” is already set to Never. I’ve disabled Encryption, Versions, and a few other apps that I thought might be causing this but its had no effect.

Does anyone have a clue as to what might be causing this?