Yes, the hard drives from Synology DS213 are compatible with Synology DS218j. Both models use the same type of hard drives, so you can transfer the hard drives from DS213 to DS218j without any issues. However, it is always recommended to check the compatibility list on Synology's website to ensure that the specific hard drives you have are supported by the DS218j model. **

The DPI (dots per inch) quality of photos on a Synology NAS does not deteriorate on its own. The NAS is simply a storage device, and it does not alter the quality of the photos stored on it. However, if the photos are accessed or edited using different software or devices, the DPI quality may be affected by the capabilities of those tools. It's important to use high-quality software and devices when working with photos to ensure that the DPI quality is maintained. **

The choice between Synology and WD My Cloud depends on your specific needs. Synology offers a wider range of features and customization options, making it a better choice for advanced users or businesses. On the other hand, WD My Cloud is more user-friendly and straightforward, making it a good option for those who prioritize simplicity and ease of use. Consider your technical expertise and the specific features you need when making your decision. **

The choice of which Synology NAS is better suited depends on the specific needs and requirements of the user. If the user needs a more powerful and high-performance NAS for demanding tasks such as 4K video editing, virtualization, or large-scale data storage, then a higher-end model like the Synology DS1621xs+ or DS1821+ would be better suited. On the other hand, if the user has more basic storage and backup needs for home or small office use, a more affordable and entry-level model like the Synology DS220+ or DS420+ would be a better fit. It's important to consider factors such as storage capacity, processing power, and budget when choosing the right Synology NAS. **

A Synology NAS 2 is a network-attached storage device designed by Synology Inc. It is a compact and efficient storage solution that allows users to store and access their data from multiple devices over a network. The NAS 2 typically comes with two drive bays, allowing users to set up a RAID configuration for data redundancy and increased storage capacity. It also offers a range of features such as data backup, file sharing, media streaming, and remote access, making it a versatile and reliable storage solution for home or small business use. **

A Synology DNS Server is a network server that is designed to manage and resolve domain names to IP addresses within a local network. It allows devices within the network to easily communicate with each other and access the internet by translating human-readable domain names into machine-readable IP addresses. The Synology DNS Server also provides features such as domain name caching, forwarding, and zone management, making it a valuable tool for network administrators to ensure smooth and efficient network operations. **

You can expand your Synology NAS by adding additional hard drives to the available drive bays or by connecting an expansion unit such as the Synology DX517. By adding more hard drives, you can increase the storage capacity and potentially improve the performance of your NAS through RAID configurations. Additionally, you can also expand your NAS by utilizing the available USB and eSATA ports to connect external storage devices for additional storage capacity. Lastly, you can also expand the functionality of your NAS by installing additional RAM or SSD cache to improve its performance for specific tasks. **

To upgrade your Synology NAS, you can start by checking for any available firmware updates through the DSM (DiskStation Manager) interface. You can do this by logging into your NAS and navigating to the Control Panel > Update & Restore. If there is a new firmware version available, you can simply click on the "Update Now" button to start the upgrade process. Additionally, you can also upgrade the hardware of your NAS by adding more RAM, replacing hard drives with larger capacity ones, or adding expansion units for additional storage. It's important to follow the manufacturer's guidelines and recommendations when upgrading your Synology NAS to ensure compatibility and proper functioning. **