Scalable NAS with SSD cache acceleration capability Synology DiskStation DS1520+ is an ideal network-attached storage solution suitable for small office and IT enthusiasts. Two built-in M.2 SSD slots and Synology SSD Cache technology allow you to boost system I/O and application performance. The scalable storage design of DS1520+ lets you start small and expand storage capacity with Synology DX517 as your data grows. CPU 4-core 2.0 GHz, burst up to 2.7 GHz Cache Acceleration 2 x built-in M.2 2280 NVMe SSD slots Performance Average 19.8% boost to computing-intensive applications Scalability Expand up to 15 drives with a DX517 expansion unit Optimize performance and capacity DS1520+ provides two built-in M.2 SSD slots so that you can take full advantage of Synology SSD Cache functionality. Add SSD cache for up to 20 times faster I/O response without using front drive bays. You can add 10 more drives with two Synology DX517 to expand storage capacity. Accelerate demanding applications A more powerful CPU speeds up computing-intensive applications. The new 4-core processor boosts photo indexing, database response times, and web PHP response efficiency. Easily categorize your photo memories, smoothly manage files across computers and mobile devices, and enjoy blazing fast web applications. Access and sync your files seamlessly Synology Drive provides a built-in universal portal to access your data anytime and anywhere, and synchronize all your files across platforms, including Windows, macOS, Linux, Android, and iOS. Sync files on demand: Save the storage space and network bandwidth of your PC. Go back in time: Easily retrieve previous versions of your shared files. Back up your data: Protect your files as scheduled or in real-time. Real-time collaboration on your private cloud Synology Office is a collaboration package combining the convenience and usability of public clouds with the data privacy and security guaranteed by private clouds. It allows you to work seamlessly together on documents and spreadsheets in a protected environment. Real-time collaboration on the same online documents to boost productivity, Instant communication on Synology Chat during the editing of documents or spreadsheets Version control for you to navigate all the changes and retrieve previous versions with just a click Virtual Machine Manager Virtual Machine Manager enables you to test new software in sandboxes, isolate your customers' machines, and increase the flexibility of your server. You can easily run Windows, Linux, and Virtual DSM on your Synology NAS by just a few steps. Snapshots for virtual machines Perfectly clone and restore a virtual machine within seconds. Live migration Seamlessly migrate Virtual DSM instances from a Synology NAS to another. Multi-tenant environment Create multiple isolated virtual machines for subsidiary business units or departments. Powered by Synology DSM Multimedia Complete multimedia solution for management, streaming, and playback. Hyper Backup Store multiple backup versions with block-level incremental data backup and cross-version deduplication. Desktop Backup Simplified backup solution for your Mac, PC, and mobile devices.