Assets prior to date removed

Hello,

This morning my client discovered that all images added prior to January 24 are gone. They have all been added through the assets app. I am aware that there is a 2MB upload limit for files. But I fail to understand how this would cause all images to be removed.

I updated perch to 2.8.5 a few days ago, but the pictures disappeared just this morning.

Diagnostics report:

Perch: 2.8.5
Production mode: Production (100)
Installed apps: content (2.8.5), assets (2.8.5), categories (2.8.5), perch_blog (4.6), perch_forms (1.8.3), perch_mailchimp (2.0.1)
DB driver: PDO
DB tables: perch2_blog_authors, perch2_blog_comments, perch2_blog_index, perch2_blog_posts, perch2_blog_posts_to_tags, perch2_blog_sections, perch2_blog_tags, perch2_categories, perch2_category_counts, perch2_category_sets, perch2_content_index, perch2_content_items, perch2_content_regions, perch2_forms, perch2_forms_responses, perch2_mailchimp_campaigns, perch2_mailchimp_history, perch2_mailchimp_log, perch2_mailchimp_stats, perch2_mailchimp_subscribers, perch2_navigation, perch2_navigation_pages, perch2_page_templates, perch2_pages, perch2_resource_log, perch2_resource_tags, perch2_resources, perch2_resources_to_tags, perch2_settings, perch2_user_privileges, perch2_user_role_privileges, perch2_user_roles, perch2_users
Users: 5
App runtimes:
<?php
    $apps_list = array(
        'content',
        'categories',
        'perch_blog',
    'perch_forms'
    );
?>
Scheduled tasks for perch_mailchimp: update_list_stats (60 mins)
Scheduled tasks for perch_blog: delete_spam_comments (1440 mins)
Editor plug-ins: markitup
H1: cb7d7dfeeae55586667d5db6ad140e67
L1: f4d6cce868d1139f655ffa2bc1cc25a0
headerColour: #ffffff
content_singlePageEdit: 1
helpURL:
siteURL: /
hideBranding: 1
content_collapseList: 1
lang: en-gb
update_2.7.6: done
latest_version: 2.8
on_sale_version: 2.8.6
perch_blog_update: 5.0
perch_blog_post_url: /news/newsfeed/post.php?s={postSlug}
headerScheme: light
dashboard: 0
perch_blog_slug_format: %Y-%m-%d-{postTitle}
perch_blog_akismet_key:
perch_blog_max_spam_days: 0
hide_pwd_reset: 0
content_hideNonEditableRegions: 0
content_frontend_edit: 0
perch_blog_comment_notify: 0
perch_mailchimp_secret: 9935ae06b9299ac5d3afa67eeb92b228
perch_mailchimp_update: 2.0
perch_mailchimp_api_key: 0f1f1fc4c31cb36f259b72b75dd366c2-us10
perch_mailchimp_list_id: ecce2b290b
perch_mailchimp_campaign_url: /mailchimp/campaign.php?s={campaignSlug}
update_2.8.5: done
PERCH_DEVELOPMENT: 10
PERCH_STAGING: 50
PERCH_PRODUCTION: 100
PERCH_DB_USERNAME: root
PERCH_DB_SERVER: localhost
PERCH_DB_DATABASE: perch
PERCH_DB_PREFIX: perch2_
PERCH_TZ: UTC
PERCH_EMAIL_FROM: mail@nicolai.io
PERCH_EMAIL_FROM_NAME: Nicolai Davies
PERCH_LOGINPATH: /perch
PERCH_PATH: /var/www/html/perch
PERCH_CORE: /var/www/html/perch/core
PERCH_RESFILEPATH: /var/www/html/perch/resources
PERCH_RESPATH: /perch/resources
PERCH_HTML5: 1
PERCH_DEBUG: 1
PERCH_RUNWAY:
PERCH_ERROR_MODE: DIE
PERCH_DATE_LONG: %d %B %Y
PERCH_DATE_SHORT: %d %b %Y
PERCH_TIME_SHORT: %H:%M
PERCH_TIME_LONG: %H:%M:%S
PERCH_PREVIEW_ARG: preview
PERCH_TEMPLATE_PATH: /var/www/html/perch/templates
PERCH_DEFAULT_DOC: index.php
PERCH_DEFAULT_EXT: .php
PERCH_PRODUCTION_MODE: 100
PERCH_RWD:
PERCH_HTML_ENTITIES:
PERCH_SSL:
PERCH_STRIPSLASHES:
PERCH_PROGRESSIVE_FLUSH: 1
PERCH_AUTH_PLUGIN:
PERCH_DB_CHARSET: utf8
PERCH_DB_PORT:
PERCH_DB_SOCKET:
HOSTING SETTINGS

PHP: 5.5.9-1ubuntu4.4
Zend: 2.5.0
OS: Linux
SAPI: apache2handler
Safe mode: not detected
MySQL client: 5.5.38
MySQL server: 5.5.38-0ubuntu0.14.04.1
Extensions: Core, date, ereg, libxml, openssl, pcre, zlib, bcmath, bz2, calendar, ctype, dba, dom, hash, fileinfo, filter, ftp, gettext, SPL, iconv, mbstring, session, posix, Reflection, standard, shmop, SimpleXML, soap, sockets, Phar, exif, sysvmsg, sysvsem, sysvshm, tokenizer, wddx, xml, xmlreader, xmlwriter, zip, apache2handler, PDO, gd, json, mysql, mysqli, pdo_mysql, readline, mhash, Zend OPcache
GD: Yes
ImageMagick: No
PHP max upload size: 2M
PHP max form post size: 8M
PHP memory limit: 128M
Total max uploadable file size: 2M
Resource folder writeable: Yes
Session timeout: 24 minutes
Native JSON: Yes
Filter functions: Yes
Transliteration functions: No
HTTP_HOST: waterford.sz
HTTP_CONNECTION: keep-alive
HTTP_ACCEPT: text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,*/*;q=0.8
HTTP_USER_AGENT: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_10_1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/42.0.2311.135 Safari/537.36
HTTP_REFERER: https://waterford.sz/perch/core/settings/diagnostics/index.php
HTTP_ACCEPT_ENCODING: gzip, deflate, sdch
HTTP_ACCEPT_LANGUAGE: en-US,en;q=0.8,da;q=0.6,de;q=0.4
HTTP_COOKIE: PHPSESSID=t1b60i3aef54ovmqo6nd3u03q6; cmsa=1; _ga=GA1.2.702016349.1419466462; _gat=1
PATH: /usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin
SERVER_SIGNATURE: <address>Apache/2.4.7 (Ubuntu) Server at waterford.sz Port 80</address>
SERVER_SOFTWARE: Apache/2.4.7 (Ubuntu)
SERVER_NAME: waterford.sz
SERVER_ADDR: 188.166.4.200
SERVER_PORT: 80
REMOTE_ADDR: 41.215.152.19
DOCUMENT_ROOT: /var/www/html
REQUEST_SCHEME: http
CONTEXT_DOCUMENT_ROOT: /var/www/html
SERVER_ADMIN: webmaster@localhost
SCRIPT_FILENAME: /var/www/html/perch/core/settings/diagnostics/index.php
REMOTE_PORT: 62828
GATEWAY_INTERFACE: CGI/1.1
SERVER_PROTOCOL: HTTP/1.1
REQUEST_METHOD: GET
QUERY_STRING: extended
REQUEST_URI: /perch/core/settings/diagnostics/index.php?extended
SCRIPT_NAME: /perch/core/settings/diagnostics/index.php
PHP_SELF: /perch/core/settings/diagnostics/index.php
REQUEST_TIME_FLOAT: 1430738847.872
REQUEST_TIME: 1430738847