mergerfs is described as 'Union filesystem geared towards simplifing storage and management of files across numerous commodity storage devices. It is similar to mhddfs, unionfs, and aufs' and is a File Manager in the backup & sync category. There are six alternatives to mergerfs for Linux, BSD, FreeBSD and Windows. The best mergerfs alternative is OpenZFS, which is both free and Open Source. Other great apps like mergerfs are btrfs, StableBit DrivePool, Greyhole and mhddfs.
OpenZFS is an advanced file system and volume manager which was originally developed for Solaris and is now maintained by the OpenZFS community.
OpenZFS is the most popular Linux alternative to mergerfs.
OpenZFS is the most popular Open Source & free alternative to mergerfs.
Btrfs is a modern copy on write (CoW) filesystem for Linux aimed at implementing advanced features while also focusing on fault tolerance, repair and easy administration.
StableBit DrivePool is the most popular Windows alternative to mergerfs.
StableBit DrivePool is the most popular commercial alternative to mergerfs.
Greyhole is an application that uses Samba to create a storage pool of all your available hard drives (whatever their size, however they're connected), and allows you to create redundant copies of the files you store, in order to prevent data loss when part of your hardware...
Bcachefs is an advanced new filesystem for Linux, with an emphasis on reliability and robustness and the complete set of features one would expect from a modern filesystem.
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