[Bug]: Restored Nextcloud VM deletes more recent files from clients

[Isaacntk]

⚠️ This issue respects the following points: ⚠️

• This is a bug, not a question or a configuration/webserver/proxy issue.
• This issue is not already reported on Github (I've searched it).
• Nextcloud Server is up to date. See Maintenance and Release Schedule for supported versions.
• Nextcloud Server is running on 64bit capable CPU, PHP and OS.
• I agree to follow Nextcloud's Code of Conduct.

Bug description

I recently caused some issues on my host that required me to restore my Nextcloud VM from a backup from two weeks ago. I have a nextcloud client with the more recent files synced via virtual files (the specific folder in was set to "always keep on this device")

After restoring my Nextcloud VM and logging the client in, all files created after the backup were removed permanently from the client without warning

Steps to reproduce

1. Have a windows client synced with virtual file support turned on
2. Right-click a synced folder and select "Always keep on this device"
3. Backup nextcloud VM
4. Add new files to synced folder
5. Stop nextcloud VM
6. Restore nextcloud VM to backup from step 3
7. Login to nextcloud again on client

The result is the files added in step 4 are deleted from the client

Expected behavior

Nextcloud client should provide some warning before deleting the files OR provide some way to restore said files after deletion

Installation method

Manual installation

Operating system

Debian/Ubuntu

PHP engine version

PHP 7.4

Web server

Apache (supported)

Database engine version

MariaDB

Is this bug present after an update or on a fresh install?

No response

Are you using the Nextcloud Server Encryption module?

No response

What user-backends are you using?

• Default user-backend (database)
• LDAP/ Active Directory
• SSO - SAML
• Other

Configuration report

{
    "system": {
        "instanceid": "***REMOVED SENSITIVE VALUE***",
        "passwordsalt": "***REMOVED SENSITIVE VALUE***",
        "secret": "***REMOVED SENSITIVE VALUE***",
        "trusted_domains": [
            "nextcloud.domain.com"
        ],
        "memcache.local": "\\OC\\Memcache\\Redis",
        "memcache.locking": "\\OC\\Memcache\\Redis",
        "filelocking.enabled": "true",
        "redis": {
            "host": "***REMOVED SENSITIVE VALUE***",
            "port": 0,
            "dbindex": 0,
            "timeout": 1.5
        },
        "datadirectory": "***REMOVED SENSITIVE VALUE***",
        "trusted_proxies": "***REMOVED SENSITIVE VALUE***",
        "forcessl": true,
        "overwrite.cli.url": "https:\/\/nextcloud.domain.com",
        "overwritehost": "nextcloud.domain.com",
        "overwriteprotocol": "https",
        "overwritewebroot": "",
        "dbtype": "mysql",
        "version": "24.0.3.2",
        "dbname": "***REMOVED SENSITIVE VALUE***",
        "dbhost": "***REMOVED SENSITIVE VALUE***",
        "dbport": "",
        "dbtableprefix": "oc_",
        "dbuser": "***REMOVED SENSITIVE VALUE***",
        "dbpassword": "***REMOVED SENSITIVE VALUE***",
        "logtimezone": "UTC",
        "installed": true,
        "mail_from_address": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpmode": "smtp",
        "mail_domain": "***REMOVED SENSITIVE VALUE***",
        "maintenance": false,
        "theme": "",
        "loglevel": 2,
        "mail_smtpauthtype": "LOGIN",
        "mail_smtpsecure": "tls",
        "mail_smtphost": "***REMOVED SENSITIVE VALUE***",
        "mail_smtpport": "587",
        "mail_smtpauth": 1,
        "mail_smtpname": "***REMOVED SENSITIVE VALUE***",
        "mail_smtppassword": "***REMOVED SENSITIVE VALUE***",
        "mail_sendmailmode": "smtp",
        "defaultapp": "files",
        "mysql.utf8mb4": true,
        "enable_previews": false,
        "enabledPreviewProviders": [
            "OC\\Preview\\PNG",
            "OC\\Preview\\JPEG",
            "OC\\Preview\\GIF",
            "OC\\Preview\\BMP",
            "OC\\Preview\\XBitmap",
            "OC\\Preview\\MP3",
            "OC\\Preview\\TXT",
            "OC\\Preview\\MarkDown",
            "OC\\Preview\\OpenDocument",
            "OC\\Preview\\Krita",
            "OC\\Preview\\Movie"
        ],
        "default_phone_region": "MY"
    }
}

List of activated Apps

Enabled:
  - accessibility: 1.10.0
  - activity: 2.16.0
  - breezedark: 24.0.2
  - circles: 24.0.0
  - cloud_federation_api: 1.7.0
  - comments: 1.14.0
  - contactsinteraction: 1.5.0
  - dav: 1.22.0
  - federatedfilesharing: 1.14.0
  - federation: 1.14.0
  - files: 1.19.0
  - files_downloadactivity: 1.13.0
  - files_external: 1.16.1
  - files_markdown: 2.3.6
  - files_pdfviewer: 2.5.0
  - files_rightclick: 1.3.0
  - files_sharing: 1.16.2
  - files_trashbin: 1.14.0
  - files_versions: 1.17.0
  - files_videoplayer: 1.13.0
  - firstrunwizard: 2.13.0
  - logreader: 2.9.0
  - lookup_server_connector: 1.12.0
  - maps: 0.2.0
  - metadata: 0.16.0
  - nextcloud_announcements: 1.13.0
  - notifications: 2.12.0
  - oauth2: 1.12.0
  - password_policy: 1.14.0
  - photos: 1.6.0
  - privacy: 1.8.0
  - provisioning_api: 1.14.0
  - registration: 1.5.0
  - serverinfo: 1.14.0
  - settings: 1.6.0
  - sharebymail: 1.14.0
  - support: 1.7.0
  - survey_client: 1.12.0
  - systemtags: 1.14.0
  - text: 3.5.1
  - theming: 1.15.0
  - twofactor_backupcodes: 1.13.0
  - twofactor_totp: 6.4.0
  - unroundedcorners: 1.0.3
  - updatenotification: 1.14.0
  - user_status: 1.4.0
  - viewer: 1.8.0
  - weather_status: 1.4.0
  - workflowengine: 2.6.0
Disabled:
  - admin_audit
  - camerarawpreviews: 0.7.16
  - checksum: 1.1.4
  - dashboard: 7.2.0
  - encryption
  - recommendations: 0.4.0
  - unsplash: 1.2.5
  - user_ldap

Nextcloud Signing status

No response

Nextcloud Logs

No response

Additional info

Nextcloud server version 24.0.3
Nextcloud windows client Version 3.4.1 Using virtual files plugin: wincfapi

[szaimen]

Hi, you probably did not run

https://docs.nextcloud.com/server/stable/admin_manual/maintenance/restore.html#restoring-backup