Cross-Office File Syncing & Sharing

In the globalized era, more companies have teams working in different parts of the world that all require access to the same sets of files. Synology’s cross-office file syncing and sharing solution seamlessly synchronizes data across individual sites, so that employees can focus on delivering the best results.

Efficient multi-site file exchange

Make data available on your global file servers

A Synology NAS can not only serve as their local file server but also keep specific folders synchronized on every NAS in real-time – just by installing the Synology Drive packages.

  • Customizable syncing : One-way or bi-directional syncing can be set up depending on whether you want to push materials to branch offices.
  • Reduce bandwidth consumption & faster local access : Each office only needs to sync the files once to their NAS. All its employees can then access them on a network drive at LAN speeds.
  • Change propagation : When edits are made to a file on a Synology NAS, only the changes are replicated instead of the whole file, so as to minimize bandwidth usage.
  • Flexible storage option : Branch offices of different sizes can choose from a wide range of models, starting from one-bay desktop NAS to 180-bay rack mount servers.
Make data available on your global file servers

Better control over versions and permissions

With the amount of data exchanged between different sites every day, Synology provides you with tools to set up proper control against inadvertent data breaches.

  • Historical versions : Up to 32 versions can be retained and restored by employees themselves in case they want to go back to a specific point in time, while Intelliversioning helps you keep the most important changes.
  • Account management : IT admins at company headquarters can choose to manage global employee accounts by joining all NAS to the central Windows AD (including Azure AD) or LDAP domain, or offload the management to local admins by letting them set up user accounts for their server.
  • Windows ACL & data quota : Support for Windows ACL enables admins to assign granular permissions to different departments, whereas user and shared folder-based quota minimize the chance of someone accidentally using up too much storage space.

Introduce a cloud experience to on-premises servers

More and more modern-day workers become used to the convenience of public clouds, and that’s something you can offer them using Synology as well — on your own private cloud.

  • Anytime, anywhere access : For your salesforce on the road, Synology Drive allows them to retrieve files through a web portal, a mobile app, or even syncing the required folders to their computers for offline access.
  • Real-time collaboration & external sharing : With Synology Office, multiple users can now simultaneously work on the same documents, spreadsheets or slides. Shared links can be generated for any files or folders when it’s time to deliver to external clients.

A backup plan when accidents happen

As data is synced to several Synology NAS, this solution in effect provides additional redundancy for file servers at smaller branches.

  • Ensure file availability when disaster strikes

    Bi-directional syncing between two sites ensures that when the file service in one location is interrupted, your employees still have a backup plan.
  • Centralized backup for all branch offices

    Critical data from branch offices can be synced to the server at the headquarters first. IT admins can then centrally back up the server to another location or to the cloud, without asking each local office to come up with their own DR solution.
  • Advanced data protection available

    Snapshot Replication lets admins capture snapshots and replicate them to another Synology NAS to guarantee a high RPO. Hyper Backup further offers a large selection of backup destinations, including Synology C2 and other popular public clouds.

Customer stories

See how these organizations achieved more with Synology.

Productions are often short, remote, and can be relocated without stopping. Synology NAS and its software allow us to meet various and evolving workflow needs in the ever-changing production industry.

Adopting Synology NAS not only makes sharing and syncing of teaching materials faster, but it also makes backing up teaching and student data more convenient.

We have been using Synology for years now, and the DiskStations have become a Swiss Army knife for our IT.

Productions are often short, remote, and can be relocated without stopping. Synology NAS and its software allow us to meet various and evolving workflow needs in the ever-changing production industry.

Endemol_Shine_Australia Learn more

Adopting Synology NAS not only makes sharing and syncing of teaching materials faster, but it also makes backing up teaching and student data more convenient.

First_Leap Learn more

We have been using Synology for years now, and the DiskStations have become a Swiss Army knife for our IT.

REWE Learn more

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Storage Management

  • Supports instant snapshot and restoration
  • Each LUN supports up to 256 snapshots
  • Scheduled LUN snapshots
  • LUN snapshot can be cloned and mounted as a regular LUN
  • Restore LUN from snapshot
  • Each LUN can perform one snapshot or clone task at the same time
  • Up to eight concurrent LUN snapshot/clone tasks
  • iSCSI LUN Snapshot and Clone are available on specific models only. Please see this product comparison page to learn more
  • Synology Snapshot Manager is available on VMware vSphere 5.1 or later, Windows Server 2008 R2, Windows Server 2012, Windows Server 2012 R2, and Windows Server 2016 for taking application consistent snapshot
  • Support up to 256 iSCSI targets*
  • Support up to 512 iSCSI LUNs*
  • On VMware vSphere, Synology Snapshot Manager supports up to 3 maximum concurrent snapshot tasks
  • Storage Replication Adapter for VMware Site Recovery Manager

Btrfs File System

  • Set usage/user quota for shared folders
  • Enable file self-healing to automatically detect silent data corruption, and to recover silent data error on RAID disks (RAID 1, RAID 5, RAID 6, RAID 10 and RAID F1)
  • Enable file compression to increase the flexibility of volume usage
  • Perform defragmentation on a volume to increase system performance
  • Supports shared folder snapshots and replications
  • Support instants SMB server-side copy
  • Supports browsing read-only snapshots
  • Supports Windows Previous Versions feature
  • Supports NFS version 2, 3, 4, and 4.1 protocol
  • Supports NFS 4.1 multipathing


  • For more information on the applied Synology NAS models of the Btrfs file system, please refer to here.

Directory Service

  • Receive up to 3,000 syslog events per second*
  • Historical log activity chart
  • Archiving logs by specified time, number of logs, the data size, and different hosts
  • Download archives as HTML or CSV files
  • Proactive email notification according to log severity or specified keywords
  • Customize log transferring protocol
  • Customized log formats
  • Advanced log search engine
  • SSL connection
  • Log rotation: 1 month, 3 months, 6 months, 1 year

Synology Directory Server

  • Support for Windows RSAT
  • Support for TLS domain controller certification
  • Support for custom NetBIOS domain names
  • DNS auto registration
  • Support for single domain controllers

Account & Privileges

  • Group membership and policies
  • Roaming user profiles
  • Account single sign-on
  • Home folder support

Security & Access Control

  • Kerberos-based authentication
  • Password reset via email
  • Password strength policies
  • Account lockout policies

Domain Clients

  • Microsoft Windows 7 and above
  • Linux



  • Recommended number of users: up to 1,800*
  • Recommended number of emails processed per day: up to 4,773,000*


  • Provides mail services with SMTP, IMAP, POP3 protocols
  • SMTP authorization
  • SSL secured connection
  • SMTP relay with optional TLS secured connection
  • Multiple additional domains
  • Supports LDAP/AD account
  • Daily quota to limit each user's outbound mail
  • Create aliases for local users, groups, existing aliases and external mailboxes
  • Customization of auto BCC rules, SMTP/SMTPS port number, and the maximum size of a single email
  • Migrates emails from external mail servers:
    • Microsoft Exchange
    • Gmail
    • Yahoo Mail
    • General IMAP servers


  • Spam filter: Rspamd filter engine and DNS-based blackhole list
  • Spam engine supports Chinese segmenter to effectively detect Chinese spam mail
  • Use antivirus engine ClamAV to detect virus in mail attachments
  • Google SafeBrowsing database for detecting malicious URLs in the mail threads
  • Leverage third-party databases to enhance detection for malware, phishing contents and spam
  • Post-auditing and action policies for virus-infected mails
  • Threat Monitor provides security-related information:
    • General threat statistics in clear and interactive graphs
    • Real-time status of anti-spam and antivirus engines
    • DNSBL self-check result
    • Threat sources displayed in a world map
    • Statistics of blocked Inbound and outbound mail
  • Sender validation mechanism with SPF/DKIM and DMARC
  • Content Scan filters messages containing potentially dangerous content
  • Attachment filter to block specific file types
  • Message Content Protection (MCP) to prevent sensitive data leakage
  • Mail black and white list


  • High availability architecture maximizes service uptime
  • High-speed full-text search for English, Chinese, Japanese, and Korean characters
  • Personal auto-forwarding and auto-reply rules for each user
  • Customize auto-reply message


  • Records historical email activity chart (past 1 hour, 1 day, 7 days, and 30 days) with detailed information about the quantity of inbound/outbound emails
  • Mail queue monitoring
  • Activity log and security log
  • Usage analysis to calculate email quantity of the selected users, and to monitor the mail traffic by account
  • Archive logs periodically
  • Transfer logs to the Secondary Server for backup, or syslog server for central management
  • Daily report includes summaries of
    • Hourly traffic
    • Delivered/received messages
    • Deferred/rejected messages
    • SMTP delivery failure
    • Warnings
    • Quantity of senders and recipients


  • MailPlus Server comes with 5 email accounts by default
  • License page allows for license addition
  • Licenses are all centralized in Primary Server

System Requirements

  • Synology NAS memory: 1GB RAM

Drive PC client

  • Drive PC Client is supported on Windows, Mac, and Ubuntu
  • Supports creating connections and syncing with multiple Drive servers
  • Supports syncing files and folders shared by other users
  • Supports double clicking on the tray menu to open files of any event in web browsers
  • Supports single clicking on the tray menu to open containing folders
  • Supports creating sharing links for synchronized files
  • Provides minimalist tray icons
  • Open Drive in web browsers from the system tray 
  • Supports instant pausing or deleting of established connections
  • Supports filtering event and notification logs by server
  • Notified files can be opened in containing folders or synced from the corresponding notification logs
  • Icon overlays can be enabled or disabled according to user settings
  • Customizable notification settings
  • Context menu in local file browsers for adjusting sync settings or creating sharing links
  • Customizable permission settings for sharing links to be set as public/internal and edit/view-only
  • Supports proxy connections


  • Local snapshots of shared folders on Btrfs file system and advanced file LUNs
  • Schedule snapshot and customize retention rules
  • Remove or lock versions
  • Browse and restore snapshots in the #snapshot folder in all file services or File Station
  • View snapshot data in the Previous Versions tab in the Properties dialogue on Windows PC.
  • Support up to 1,024 snapshots per shared folder*
  • Support up to 256 snapshots per iSCSI LUN*


  • Replicate data to another destination by taking and sending snapshots to local or another server. The maximum number of replication tasks is determined by different modules of Synology NAS. For more information, please go to Synology's official website
  • Schedule replication and customize retention rules
  • Send the initial replication copy via the Internet or storage devices
  • Replicate data to multiple destination servers from the same source server
  • Statistics of transferred size and sync duration are recorded and displayed as a report
  • Overview topology of data replication
  • Supports port forwarding by customizing address and port of a replication task
  • Encrypt replication transmission
  • iSCSI LUN replication can be managed via Synology Snapshot Replication or VMware vCenter Site Recovery Manager. (Installing Synology SRA on VMware Site Recovery Manager servers is required.)
  • Pause/resume replication transmission to optimize bandwidth


  • Restore to a previous version via various methods including common protocols, File Station, and Windows File Explorer.
  • Perform a failover on shared folders or iSCSI LUNs and make the replicas on the destination server writable when the source server is not healthy
  • Perform a re-protect action to sync data on the two servers again after performing a failover
  • Perform a test failover to make a clone and run all necessary tests in the event of disaster
  • Perform a force failover when the source server is healthy


Security Advisor

  • Malware Detection and removal
  • Account and password, network-related, System-related security scan
  • DSM and packages version check

Firewall & Traffic Control

  • Allow/deny access to selected ports or services for specific IP addresses
  • Create firewall rules based on geographic region
  • Organize firewall rules into different firewall profiles
  • Traffic Control according to services and TCP/UDP ports
  • DDoS protection
  • VPN pass-through

AntiVirus Essential

  • AntiVirus Essential powered by ClamAV scanning engine
  • Full system scan
  • Scheduled scan
  • White List to exclude files from being scanned
  • Automatic update of virus definitions

AntiVirus by McAfee

  • Full system scan
  • Scheduled scan
  • White List to exclude files from being scanned
  • Automatic update of virus definitions
  • Available on specific models only. Please see this product comparison page to learn more

Auto Block

  • Block after specified number of attempts
  • Custom expiration time
  • Black and White List

DSM SSO Client

  • Supports Synology SSO Server
  • Supports OpenID Connect SSO Servers:
    • Azure
    • Websphere

Certificate Management

  • Supports the import and management of multiple certificates
  • Certificate encryption algorithm only supports RSA (ECC algorithm is not supported)
  • Supports multiple certificates for different services:
    • Web Apps (HTTPS) and WebDAV
    • Mail Services
    • RADIUS Server
    • VPN Server
  • Supports the creation and auto-renew of Let’s Encrypt certificate

TLS/SSL Profile Level Management

  • Supports multiple TLS/SSL Profile Level for different services:
    • Web Apps (HTTPS) and WebDAV
    • Mail Services
    • RADIUS Server
    • VPN Server

2-step verification

  • Time-based One-Time Password (TOTP) protocol
  • 2-step verification enforcement for admin groups or all users
  • Manage trusted devices

Log Center

  • Supported VPN protocols: PPTP, OpenVPN, L2TP over IPSec
  • Connection list and management
  • Configuration log for audit trail
  • Enable VPN connections on selected LAN port
  • Privilege settings to allow VPN connections for selected users
  • Support up to 40 connections


  1. Please note that the figures marked in asterisks are derived from the Synology lab by using high-performance client computers with optimized network settings, and could vary in different environments.