What is the warranty period for the BUFFALO TeraStation TS5820DN4804, and what kind of customer support is available post-purchase?

3-year warranty with 24/7 US-based support available post-purchase.

Can this NAS be integrated with cloud storage services, and if so, which ones are supported?

Yes, this NAS can be integrated with cloud storage services including Amazon S3, Dropbox/Dropbox Business, Microsoft Azure, and OneDrive.

Pre-tested NAS-grade hard drives included and RAID pre-configured to save you time and money

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BUFFALO TeraStation TS5820DN4804 8-Bay NAS 48TB (4x12TB) with NAS-Grade Hard Drives Included Desktop Network Attached Storage

Pre-tested NAS-grade hard drives included and RAID pre-configured to save you time and money
High Performance Business Network Storage Solution
Cloud compatibility w/ Amazon S3, Dropbox/Dropbox Business, Microsoft Azure and OneDrive
Enhanced security: Closed system, AES-256 encryption, 2-factor authentication, Snapshot backup and recovery
3-year warranty w/ 24/7 US-based support
Native 10GbE port for high speed file transfers w/ no cable upgrades needed
Vmware- and Windows Server 2022-certified for virtualization solutions
Remote Management System: Manage multiple devices from a single console to save time/resources
Optimized performance for SMB (30 - 100 concurrent users)
Unit ships with 48TB (4 x 12TB hard drives) in RAID 5, giving you 36TB of usable hard drive space and 4 open bays for future expansion up to 160TB
2.04 GHz Quad-Core Processor w/ 8GB ECC memory
Includes NovaBACKUP software licenses for professional-level server and PC backups
TAA compliant - Made in Japan