How secure is this against malicious attacks? Does it have a firewall and anti-virus software?

The DSM software come with a number of features to prevent malicious attacks. One of my units was hit with a ransomware attack. Nothing import on the unit as it was used for security camera video storage. I believe I was hit with what is called man in the middle hack. My credentials were taken when I periodically logged in to view the camera images. I was not taking the security seriously. Now I have turned on HTTPS and 2FA (two factor authentication). Point is that the features are there to secure you NAS but you have to make use of them. Hope this helps.

would this unit support a NVME cache module?

Yes the Synology DS1522+ supports 2 of the NVMe M.2's in mirror (RAID1) for write-back cache, or just 1 of them for read-only cache. (You cannot force it to use 1 of them for read-write). Starting with the year 2022 models, as of date of this review October 2022, Synology no longer lists as compatible any drive except their own brand (vendor-lock). However, if you look at the prior version of this unit Synology 1520+, you'll see other options that DO work like certain Seagate m.2 Ironwolf (but not all of them).. Unfortunately, the Synology DSM 7.1 in these newer 2022 models will currently show a warning anything except their own brand of drives may not support all features and compatibility is not guaranteed either. Customers are not happy about this vendor-lock situation, hopefully Synology will cave in and certify other drives in the future.

Can you install a 10gb nic in here?

No, this model does not have the slot for the 10gb nic. You can see this by the absence of a square cutout such as the one on the back of the ds1522+.

How often is the os/firmware patched? i'd like to verify that this nas stays as secure as possible.

As needed. I've had a few updates (3 or 4) since I purchased my DS220+ last fall. Your NAS should be behind your router/firewall, and I don't allow access to mine outside of my network/home. Personally, I have no need to access it from the Internet, aside from update downloads.

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💼 Elevate your data game—where business meets bulletproof storage.

COMPACT YET ROBUST DESIGN - Sleek black chassis with a lightweight 4.19 kg frame fits perfectly in any modern office or home setup.
MASSIVE 5 BAY STORAGE POWER - Expand effortlessly with up to 216 TB raw capacity using DX517—future-proof your data needs.
ENTERPRISE GRADE SURVEILLANCE - Integrated Surveillance Station transforms your NAS into a powerful NVR solution for 24/7 security monitoring.
MOBILE READY PHOTO MANAGEMENT - Synology Photos offers intuitive mobile backup and sharing, keeping your memories secure and social.
SEAMLESS FILE SHARING BACKUP - Synology Drive and Active Backup for Business ensure your files and systems are always protected and accessible.

The Synology DiskStation DS1522+ is a versatile 5-bay NAS designed for professionals seeking scalable storage up to 216 TB. It combines powerful backup solutions, mobile photo management, and enterprise-grade surveillance in a compact, stylish black chassis, making it the ultimate hub for secure data management and seamless file sharing.

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Brand	Synology
Manufacturer	Synology, Synology Inc., 9F., No.1, Yuandong Rd., Banqiao Dist., New Taipei City 220632, Taiwan
Series	PLus
Colour	Black
Item Height	6.54 Inches
Item Width	9.06 Inches
Product Dimensions	23.29 x 23.01 x 16.61 cm; 4.19 kg
Item model number	DS1522+
Hard Disk Description	Disk-less
Are Batteries Included	No
Included Components	Main Unit X 1 Accessory Pack X 1 Quick Installation Guide X 1
Manufacturer	Synology
Item Weight	4 kg 190 g

Synology DiskStation DS1522+ Network Attached Storage Drive (Black)

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