Synology migration planning
Synology currently documents three primary migration paths between NAS systems: Migration Assistant, HDD migration and Hyper Backup. They are not interchangeable. Migration Assistant is attractive when the new NAS will use new drives; HDD migration is attractive when keeping the same drive set; Hyper Backup is slower but offers more flexibility when model limitations or a new filesystem make direct migration unsuitable.
Quick answer
Choose the migration method before touching the source
A good migration preserves a rollback path. Verify the source backup, destination compatibility, DSM versions, drive plan and application inventory before any drive leaves the original chassis.
Current Amazon listings
Replacement and migration DiskStation options
Product cards are supporting purchase references only; they do not determine whether your failed drives are recoverable or whether a specific migration pairing is supported.
Technical decision
Migration is successful only when services and backups work on the destination
File presence is only one checkpoint. Validate permissions, packages, remote access, clients and a fresh backup before decommissioning the old NAS.
Interactive recovery tool
Synology Migration Method Selector
This tool routes the symptoms you select to a safer next step. It does not issue destructive commands. Before initializing a disk, deleting a pool, reinstalling DSM or moving the only copy of important data, verify the exact live Synology procedure for your model and DSM build.
Recovery safety checklist
Four rules before you change a failing Synology system
Preserve readable data first
If unique files can still be opened, copy or back them up before changing storage metadata, reinstalling DSM or running stressful diagnostics.
Record drives and bays
Capture drive serial numbers, bay positions, health states and DSM messages before swapping disks or moving them to another chassis.
Match the action to the failure layer
A degraded pool, crashed volume, failed system partition, bad drive and failed bay have different supported recovery paths.
Keep a rollback path
During migration or recovery, do not erase the source system until the destination data, permissions, applications and backups have been verified.
Choose the method before buying destination drives
Migration Assistant, HDD migration and Hyper Backup have different requirements for destination capacity, file system and drive reuse. The method decision should happen before ordering the new NAS and disks.
For an end-to-end NAS migration, choose the method before buying destination drives should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Migration Assistant favors a new destination pool
It clones data, packages and most settings while allowing the destination storage pool and RAID to be configured on the new system. That is attractive when moving to new drives and better hardware.
For an end-to-end NAS migration, migration assistant favors a new destination pool should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
HDD migration keeps the existing drive set
This method physically transfers source drives into the destination NAS. It can be quick and economical, but storage-pool and volume settings remain tied to the old layout and model or package-architecture limits can block a clean migration.
For an end-to-end NAS migration, hdd migration keeps the existing drive set should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Hyper Backup offers the most flexible rebuild
Backup and restore takes longer and needs additional storage, yet it lets the destination use a new file system, new pool design and selected packages or settings. It is the safest fallback when direct migration paths are unsupported.
For an end-to-end NAS migration, hyper backup offers the most flexible rebuild should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
DSM versions must be checked in both directions
Destination DSM generally needs to be the same as or newer than the source for supported migration. Confirm that the destination model actually supports the required DSM build before moving anything.
For an end-to-end NAS migration, dsm versions must be checked in both directions should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Drive compatibility can decide the method
A destination model may reject or warn about drives that were accepted in the source system. Check the current compatibility policy before planning HDD migration around existing media.
For an end-to-end NAS migration, drive compatibility can decide the method should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Capacity rules can block Migration Assistant
The destination needs enough usable storage for the source data and migration requirements. Do not compare raw terabytes only; RAID overhead, snapshots and reserved space affect whether the transfer can complete.
For an end-to-end NAS migration, capacity rules can block migration assistant should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Package behavior is not identical across methods
Some packages or settings cannot migrate perfectly, particularly across CPU architectures or major application changes. Inventory essential services and document how each will be verified after cutover.
For an end-to-end NAS migration, package behavior is not identical across methods should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Downtime should be planned around the final cutover
Migration Assistant can keep source services available for much of the transfer, whereas HDD movement causes a more immediate shutdown. Hyper Backup restore can take much longer but gives greater structural flexibility.
For an end-to-end NAS migration, downtime should be planned around the final cutover should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Keep the source recoverable until verification finishes
Do not erase or repurpose source drives immediately after the destination boots. Verify shared folders, permissions, packages, backups and critical files first so rollback remains possible.
For an end-to-end NAS migration, keep the source recoverable until verification finishes should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Network identity can create hidden post-migration issues
Static IP addresses, certificates, DDNS, QuickConnect, firewall rules and client mount paths may need adjustment on the destination. A successful data copy is not the same as a complete service migration.
For an end-to-end NAS migration, network identity can create hidden post-migration issues should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Finish by creating a new independent backup
Migration moves a system; it does not create resilience by itself. Once the destination is verified, establish a fresh external or off-site backup and test a restore before retiring the source NAS.
For an end-to-end NAS migration, finish by creating a new independent backup should be resolved before source hardware is altered, because the chosen method determines drive purchases, destination capacity and rollback options. Build a written cutover plan that covers source backup, target DSM level, application inventory, network identity and a verification window. Keep the original NAS recoverable after the first successful login to the destination. This checkpoint is finished only after the new system can serve real users and produce its own independent backup without depending on the old chassis.
Questions people ask
How to Migrate Synology to a New NAS Without Guessing the Method questions
What is the best way to migrate Synology to a new NAS?
It depends on whether you are keeping drives, changing filesystem or pool layout, and whether the source/destination pair supports Migration Assistant or HDD migration.
A complete migration includes method selection, cutover verification and a new destination backup. Do not erase the source immediately after the data copy finishes.
When should I use Migration Assistant?
Use it when the models are supported and you want to move data, packages and most settings into a destination that can have a newly configured storage pool.
When should I use HDD migration?
Use it when you want to move the existing drives and the source/destination models and package architectures support that path.
When should I use Hyper Backup?
Use it when direct migration is unsupported, when you want a different filesystem or pool design, or when you prefer a backup-and-restore migration.
Does the destination DSM need to be newer?
Synology's migration guidance generally requires the destination DSM to be the same as or newer than the source, with method-specific details.
Can I change RAID type during migration?
Migration Assistant can allow a newly configured destination pool, while HDD migration preserves the existing storage-pool and volume settings. Hyper Backup offers the most redesign flexibility.
Can I keep using the old NAS during migration?
Migration Assistant can keep services available for much of the transfer. Other methods have different downtime characteristics.
Should I erase the old NAS immediately afterward?
No. Keep the source intact until the destination data, packages, permissions and backups are verified.
What if my models are not compatible for Migration Assistant?
Use Hyper Backup or another supported data-copy method rather than forcing an unsupported pairing.
Is migration a backup?
No. Migration relocates the working system. Maintain an independent backup before and after the move.
Official references and methodology
Verify the live DSM state before any destructive recovery step
This end-to-end migration guide starts with the destination design and works backward to the safest transfer method. It verifies source backup, model pairing, DSM levels, drive strategy, usable capacity, package inventory and rollback before cutover. Migration is not considered complete when files appear on the destination; services, permissions, clients and a new independent backup must also be verified before the source NAS is retired.
- Synology: Migration methods between Synology NAS systems
- Synology: Migration Assistant guide
- Synology: HDD migration guide
As an Amazon Associate, Cloudzat may earn from qualifying purchases. Failure states, DSM behavior, migration compatibility and recovery options can change by model and DSM build. Preserve readable data and verify Synology's current Knowledge Center instructions before initializing drives, deleting pools, reinstalling DSM or changing the only copy of important data.