SnapRAID is described as 'Disk array backup with snapshot raid' and is an app in the backup & sync category. There are nine alternatives to SnapRAID for a variety of platforms, including Linux, Windows, Self-Hosted, Mac and Android apps. The best SnapRAID alternative is TrueNAS, which is both free and Open Source. Other great apps like SnapRAID are Unraid, Rockstor, Western Digital My Cloud and StableBit DrivePool.
TrueNAS (formerly FreeNAS) is an operating system that can be installed on virtually any hardware platform to share data over a network. TrueNAS is the simplest way to create a centralized and easily accessible place for your data.
Flexible operating system combining storage management with support for mixed drive sizes, Docker containers, virtual machines, hardware and GPU passthrough, browser-based interface, file protocols, scalable expansion, integrated parity, and monitoring features.
Western Digital My Cloud is an easy-to-use personal cloud storage device that plugs directly into your Wi-Fi router at home so you can preserve your digital life. Use the My Cloud app on your phone, tablet or computer to access it anywhere without paying a subscription fee.
It uses openSUSE Leap as a base with the Btrfs advanced file system. EasyNAS is managed through a web-based interface and offers such features as on-line growing of file systems, snapshots and copy-on-write.
Drive Bender for Windows is state of the art, single point storage pool technology for all versions of Microsoft Windows (read more).
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SnapRAID isn't a NAS, it can be installed into FreeNAS if you so wish. It's more a periodic parity + hash calc tool to augment storage. For FreeNAS it's not really necessary as the ZFS file system pretty much does what SnapRAID does - only in real time instead of periodic.