Standalone Fileserver with deduplication wanted

**Situation:** I want to reinstall a Homelab Server (Windows OS) as a linux-based Server **Server** | Purpose: Backup System (mostly offline) I currently have an HP Proliant Microserver N54\ Turion II Neo N54l 2,2Ghz , 4GB RAM https://geizhals.at/a688459.html **Setup**\ 6 physikal Disks (5 HDD, 1 SSD) in a Pool to a JBOD Storage Space (15,6TiB)\ 1 LUN, formatted NTFS\ Files are shared via Windows Share (SMB/Cifs)\ No special NTFS permissions (since it is just me)\ Windows Server 2012 R2 (soon EOL)\ Deduplication enabled , which saved almost 4,5 TiB on data\ mode = general purpose file server **Clients** Clients mostly Windows, perhaps some Linux in near future. \ Access the server via SMB/Cifs and RDP (managing) yeah, the server is slow, but the only purpose is archive, mostly turned off and sometimes access the data (single user, no parallel access needed). works OK as it is now **Goal**\ Since I want to go for linux a lot more and the Server 2012 R2 is End-of-life, I want to reinstall the system on GNU/Linux, providing the same functionality using the same base. If I read about deduplication, it is always ZFS or BTRFS but LOTS of RAM needed. Or OpenMediaVault with BorgBackup... but the client also needs BorgBackup (and Clients will Windows still) what would be the nearest equivalent linux setup?