How to Reset a Synology NAS Without Erasing Your Data
A factory reset on a Synology NAS without losing data requires careful attention to the reset method. Synology systems offer several reset options, and they do not all have the same effect. One may restore administrator access and network settings, while another reinstalls DiskStation Manager (DSM). A full system reset, however, can remove storage pools, shared folders, applications, and personal files.
Before pressing the physical reset button or selecting a reset command in DSM, identify the problem you are trying to solve. Forgotten credentials, a damaged DSM installation, incorrect network settings, and preparing a NAS for a new owner each call for a different procedure.
The safest approach is to protect your data first, confirm the status of the storage pool, and select the least destructive option. RAID redundancy can help a disk survive, but RAID is not a backup and cannot protect against accidental deletion, reset errors, malware, or hardware failure.
Understand Synology Reset Modes
Synology hardware commonly supports two reset-button modes. The first mode resets the administrator password and network configuration. It is useful when you cannot sign in or the NAS has an inaccessible IP address. It does not normally remove shared folders, installed packages, or files stored in the volume.
The second mode reinstalls DSM while preserving the data volume in supported situations. This removes much of the NAS configuration, including user accounts, network settings, package settings, and other system preferences. You may need to reinstall applications, recreate users, and reconnect backup jobs after DSM is restored.
The exact behavior can vary by model and DSM version. Consult the hardware manual for the number and timing of beeps, and avoid assuming that every Synology enclosure responds identically. A reset that is safe for a DS220+ may have different instructions on a rack-mounted unit or an older model.
Protect Files Before Touching Reset Controls
Create a current backup before resetting anything. Hyper Backup can copy shared folders and application data to another Synology NAS, USB storage, rsync server, or supported cloud destination. If the NAS is still accessible, run a backup job manually and check its completion report rather than relying only on a scheduled task.
For large media libraries, documents, and project files, confirm that the destination contains readable copies. A backup task that completed without errors is reassuring, but a sample restoration provides stronger evidence. Open several files from the backup, and if possible, test the recovery of a complete shared folder.
Snapshots can provide a fast rollback for supported Btrfs volumes, but they are not a substitute for an independent backup. Snapshots stored on the same NAS may be lost if the storage pool fails or is deliberately erased. Encrypted shared folders require additional care: preserve encryption keys and recovery information before changing DSM settings or removing packages.
Choose the Least Destructive Procedure
If the problem is a lost administrator password, start with Mode 1. With the NAS powered on, press and hold the reset button for about four seconds, usually until a beep is heard, then release it. This typically restores the default administrator access behavior and resets network settings to DHCP. Use Synology Assistant or the router’s client list to locate the NAS afterward.
A Mode 1 reset does not generally affect data, but it can interrupt services and change how the NAS is reached. After signing in, set a new strong administrator password, review the network configuration, and disable or rename default administrative accounts where DSM permits it.
If DSM is corrupted or its web interface cannot be repaired, Mode 2 may be appropriate. This usually involves pressing the reset button for the first beep, then pressing it again within the specified time until additional beeps occur. DSM is then reinstalled, while the existing storage pool and shared data are intended to remain available.
Do not start Mode 2 unless you have verified the model-specific instructions and have a backup. The process can remove configuration metadata, packages, users, permissions, and service databases. Files may remain intact while access to those files changes, creating a recovery task that is safer when documented in advance.
| Reset approach | Typical purpose | Expected data impact | Work required afterward |
|---|---|---|---|
| Mode 1 hardware reset | Recover access or reset network settings | Shared data normally remains untouched | Reconfigure password, IP settings, and access |
| Mode 2 hardware reset | Reinstall DSM when the system is damaged | Data volumes are generally preserved on supported systems | Reinstall DSM, recreate settings, and reinstall packages |
| DSM configuration reset | Clear system configuration from the interface | Depends on the selected option; read the warning carefully | Rebuild users, permissions, services, and applications |
| Full erase or factory reset | Prepare the NAS for disposal or a new owner | Storage pools and files can be deleted | Complete setup from the beginning and restore data |
Prepare the NAS for DSM Reinstallation
Before a DSM reinstallation, record the NAS model, DSM version, volume layout, shared-folder names, IP configuration, user permissions, package list, and backup destinations. Export configuration files when the interface allows it. Save the information somewhere other than the NAS so it remains available if the system becomes inaccessible.
Check Storage Manager for warnings before proceeding. A degraded RAID array, failing disk, abnormal volume status, or insufficient free space increases the risk of complications. If a drive is reporting errors, copy important data to another location first and consider replacing the failing disk before attempting a system recovery.
Disconnect unnecessary USB devices and avoid changing drive positions. On a multi-bay Synology, drive order and metadata are important. Do not remove disks from a healthy array simply because DSM needs to be reinstalled. Marking drive positions and photographing cable connections can prevent an avoidable mistake.
Use a stable power source during the process. An uninterruptible power supply is especially valuable because a power interruption during DSM installation can leave the system in a state that requires additional recovery work. Never unplug the NAS or force a shutdown while status indicators show an active reset or installation process.
Restore Configuration and Access Carefully
After DSM has been reinstalled, open the setup page and follow the instructions to reconnect to the existing storage pool. Do not choose an option that creates a new volume or initializes disks if the goal is to preserve existing files. Read every storage-related prompt and stop if the displayed action refers to erasing or formatting drives.
The shared folders may appear with their contents intact, but permissions can require repair. Recreate users and groups with the same names where practical, then check ownership and access control lists. A user who has the same display name but a different underlying identity may not automatically regain access to previously stored files.
Reinstall packages one at a time, beginning with services required for backups, file sharing, authentication, and monitoring. Applications such as Synology Photos, Drive Server, Plex, Docker projects, and databases may need separate recovery steps. Restore package data only from a verified backup and confirm compatibility with the installed DSM release.
Review SMB, NFS, FTP, WebDAV, VPN, firewall, notification, and remote-access settings. Resetting network configuration can affect mapped drives, scheduled backup jobs, media players, surveillance systems, and mobile applications. Update bookmarks and DNS records only after confirming the NAS has a stable address.
Avoid a Full Erase by Mistake
The most dangerous option is a complete system reset or secure erase. Depending on the DSM version and model, this may be available under Control Panel, Update & Restore, System Reset, or a similar area. The warning should clearly state whether data, storage pools, packages, or configuration will be removed. If it says the disks will be erased, it is not a data-preserving reset.
A full erase is appropriate when selling, recycling, or transferring ownership of the NAS. Before selecting it, encrypt or securely erase sensitive drives according to the manufacturer’s guidance, remove cloud account associations, disable remote access, and revoke backup credentials. Do not treat a quick reinstallation as sufficient protection for confidential business or personal data.
For troubleshooting, use less destructive choices first: reboot the NAS, repair DSM, reset network settings, restore a configuration backup, or reinstall DSM while retaining the data volume. The NAS storage guidance available through specialist resources can also help compare Synology features, RAID limitations, backup strategies, and recovery considerations before making a high-impact change.
Recommendations for a Safer Reset
Use this checklist before beginning the procedure:
- Verify a recent, readable backup on a separate device or service.
- Export DSM configuration details, encryption keys, package data, and network information.
- Confirm the model-specific reset sequence and identify whether it is Mode 1 or Mode 2.
- Inspect Storage Manager for degraded arrays, disk warnings, or volume errors.
- Rebuild users, permissions, packages, and backup schedules after DSM is restored.
- Run a file-access test and a fresh backup after recovery is complete.
A reset is finished only when the NAS is functioning as a storage system again, not merely when DSM loads. Confirm that shared folders open from client devices, scheduled tasks run, snapshots or replication are active where required, and notifications reach the correct administrator.
If the NAS contains irreplaceable files and no independent backup exists, pause before using any reset mode. Obtain a backup destination or professional recovery advice first. A short delay is safer than turning a configuration problem into permanent data loss.
Follow the model-specific instructions, preserve a verified backup, and choose the narrowest reset that solves the problem. Once DSM is running again, document the restored settings and test a real file recovery so the next failure can be handled with less risk.