Hyper Backup

Back up files, iSCSI LUNs, installed applications, and system configurations to destinations including Synology C2 Storage, public cloud platforms, USB devices, file servers, local folders, or other Synology NAS.
Set and forget backup tasks with regular schedules, enhance security with fine-grained user permissions and encryption, keep backup sizes small with built-in deduplication5, and restore data flexibly with multi-versioning. Learn more

Snapshot Replication

Snapshot Replication enables flexible point-in-time snapshots of shared folders and virtual machines with an RPO as low as 5 minutes and recovery within seconds. Learn more

Active Backup Suite

Securely back up Windows clients and servers, Microsoft 365 and Google Workspace accounts, file servers, and VMware and Hyper-V virtual machines with the Active Backup Suite.
Leverage built-in deduplication6 technology to reduce backup sizes and multi-versioning to allow flexible restoration. Learn more

Serving remote workforces

Keep your remote workforce connected with powerful out-of-the-box solutions for collaboration, file sharing, and communication.

• 

  Synology Drive

  Host your own private cloud behind the safety of your NAS with 100% data ownership and no subscription fees. Learn more

• 

  Synology Office

  Create documents, spreadsheets, and slides in a multi-user environment. Real-time collaboration and automatic saving make remote work sessions a breeze. Learn more

• 

  Synology Chat

  Discuss and collaborate with colleagues using secure messaging designed for teams, with mobile, desktop, and browser clients. Learn more

Storage for virtualization

DSM streamlines provisioning for and management of virtual machines with full certification for VMware® vSphere™, Microsoft® Hyper-V®, Citrix® XenServer™, and OpenStack virtualization environments.
Synology Storage Console for VMware or Windows platforms lets you manage storage directly from your hypervisor. VMware VAAI integration and Windows ODX help offload storage operations and speed up data transfer. Learn more

   

Works best with Synology drives

Engineered to handle intensive 24/7 workloads, Synology drives consistently deliver top-grade performance.

SATA 3.5” HDD HAT5300 

NVMe M.2 SSD SNV30004 

SATA 2.5” SSD SAT5200 

Powered by Synology DiskStation Manager

The web-based DiskStation Manager (DSM) operating system supports a host of native productivity and management solutions.

Central Management System

Conveniently manage your fleet of Synology NAS from a centralized console.

Learn more

Synology Drive

Instantly access your NAS files across multiple devices whenever you want, wherever you are.

Learn more

Collaboration Suite

Satisfy all team collaboration needs behind the safety of your own private cloud with Synology Office, Calendar, and Chat.

Learn more

Virtual Machine Manager

Run various operating systems in isolated sandboxes. Seamlessly clone, store, and migrate virtual machines.

Learn more

Security

Shield your Synology NAS from the most sophisticated threats with industry-leading security solutions.

Learn more

Surveillance

Protect your home or business with intelligent monitoring and video management tools.

Learn more

We have you covered

RS2421+/RS2421RP+ is backed by Synology’s three-year hardware warranty. An optional two-year extended warranty that extends coverage to five years is available in select regions. Learn more

• 1Power button and indicator
• 2Status Indicator
• 3Alert Indicator
• 4Alert Off Button
• 5Drive tray

• 6Drive status indicator
• 7Rail Kit Release Tab
• 8Power Port
• 9PSU Indicators & Alert Off Buttons (RS2421RP+)
• 10PSU fan

• 11PSU on/off switch
• 12Console port
• 131GbE RJ-45 port
• 14USB 3.2 Ports
• 15Expansion port

• 16Reset button
• 17PCIe expansion slot

CPU	CPU Model	AMD Ryzen V1500B
	CPU Quantity	1
	CPU Architecture	64-bit
	CPU Frequency	4-core 2.2 GHz
	Hardware Encryption Engine (AES-NI)
Memory	System Memory	4 GB DDR4 ECC UDIMM
	Memory Module Pre-installed	4 GB (4 GB x 1)
	Total Memory Slots	2
	Maximum Memory Capacity	32 GB (16 GB x 2)
	Notes	Please select Synology memory modules for optimum compatibility and reliability. Synology will not provide complete product warranty or technical support if non-Synology memory modules are used for memory expansion. Synology reserves the right to replace memory modules with the same or higher frequency based on supplier’s product life cycle status. Rest assured that the compatibility and stability have been strictly verified with the same benchmark to ensure identical performance.
Storage	Drive Bays	12
	Maximum Drive Bays with Expansion Unit	24 (RX1217/RX1217RP x 1)
	Compatible Drive Type* (See all supported drives)	3.5″ SATA HDD 2.5″ SATA HDD 2.5″ SATA SSD
	Maximum Single Volume Size*	108 TB
	Hot Swappable Drive
	Notes	It is strongly recommended that you only install drives listed on your device’s compatibility list. Storage pool and volume creation processes may fail when using unverified drives. Synology is unable to provide technical support for devices using unsupported components. “Compatible drive type” indicates drives that have been tested to be compatible with Synology products. This term does not indicate the maximum connection speed of each drive bay. Each internal volume (may consist of multiple drives) is expandable up to 108TB.
External Ports	RJ-45 1GbE LAN Port	4 (with Link Aggregation / Failover support)
	USB 3.2 Gen 1 Port*	2
	Expansion Port	1
	Notes	The USB 3.0 standard was renamed to USB 3.2 Gen 1 by the USB Implementers Forum (USB-IF) in 2019.
PCIe	PCIe Expansion	1 x Gen3 x8 slot (x4 link)
File System	Internal Drives	Btrfs EXT4
	External Drives	Btrfs EXT4 EXT3 FAT NTFS HFS+ exFAT
Appearance	Form Factor (RU)	2U
	Size (Height x Width x Depth)	RS2421+ :88 mm x 482 mm x 552 mmRS2421RP+ :88 mm x 482 mm x 578 mm
	Weight	RS2421+ :11.5 kgRS2421RP+ :11.9 kg
	Rack Installation Support*	4-post 19″ rack (Synology Rail Kit – RKS1317)
	Notes	The rail kit is sold separately
Others	System Fan	60 mm x 60 mm x 3 pcs
	Fan Speed Mode	Full-Speed Mode Cool Mode Quiet Mode
	Easy Replacement System Fan
	Power Recovery
	Noise Level*	RS2421+ :50.1 dB(A)RS2421RP+ :54 dB(A)
	Scheduled Power On / Off
	Wake on LAN / WAN
	Power Supply Unit / Adapter	RS2421+ :500 WRS2421RP+ :350 W
	Redundant Power Supply	RS2421+ :–RS2421RP+ :
	AC Input Power Voltage	100 V to 240 V AC
	Power Frequency	50/60 Hz, Single Phase
	Power Consumption*	RS2421+ :79.56 W (Access) 34.89 W (HDD Hibernation) RS2421RP+ :91.76 W (Access) 48.21 W (HDD Hibernation)
	British Thermal Unit	RS2421+ :271.65 BTU/hr (Access) 119.13 BTU/hr (HDD Hibernation) RS2421RP+ :313.31 BTU/hr (Access) 164.61 BTU/hr (HDD Hibernation)
	Notes	Power consumption is measured when it is fully loaded with Western Digital 1TB WD10EFRX hard drive(s). Noise Level Testing Environment: Fully loaded with Seagate 2TB ST2000VN000 hard drive(s) in the idle state. Two G.R.A.S. Type 40AE microphones, each set up 1 meter away from the Synology NAS at the front and rear. Background noise: 16.49-17.51 dB(A); Temperature: 24.25-25.75˚C; Humidity: 58.2-61.8%
Temperature	Operating Temperature	0°C to 35°C (32°F to 95°F)
	Storage Temperature	-20°C to 60°C (-5°F to 140°F)
	Relative Humidity	5% to 95% RH
Certification	FCC CE BSMI EAC CCC KC UL VCCI RCM
Warranty	3-year hardware warranty, extendable to 5-year coverage – EW202
	Notes	The warranty period starts from the purchase date as stated on your purchase receipt. (Learn more)
Environment	RoHS Compliant
Packaging Content	RS2421+ : Main Unit X 1 Accessory Pack X 1 AC Power Cord X 1 Quick Installation Guide X 1 RS2421RP+ : Main Unit X 1 Accessory Pack X 1 AC Power Cord X 2 Quick Installation Guide X 1
Optional Accessories	DDR4 ECC UDIMM: D4EU01-4G/D4EC-2666-8G/D4EC-2666-16G Expansion Units: RX1217/RX1217RP 3.5″ SATA HDD: HAT5300 2.5″ SATA SSD: SAT5200 M.2 SSD & 10GbE Combo Adapter Card: E10M20-T1 M.2 SSD Adapter Card: M2D20 25GbE Network Interface Card: E25G21-F2 10GbE Network Interface Card: E10G21-F2/E10G18-T2/E10G18-T1 Rail Kit Sliding: RKS1317 VisualStation: VS960HD/VS360HD Surveillance Device License Pack
	Notes	All memory modules will operate at the maximum frequency specified by the CPU manufacturer.