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Based on our record, Unraid seems to be a lot more popular than Postfix. While we know about 13 links to Unraid, we've tracked only 1 mention of Postfix. We are tracking product recommendations and mentions on various public social media platforms and blogs. They can help you identify which product is more popular and what people think of it.
Read the documentation on postfix.org and/or buy one of the many available Postfix books (it really helps to understand the Postfix philosophy). Source: about 3 years ago
Really: I've got a Synology 10-disk unit in JBOD mode (each drive independent, but see SnapRaid) containing backup of backups and recent set of 4x 14TB unopened drives. I'm working at building a new UnRaid system to contain everything; I just need to confirm the power supply max load and if I can stagger the drives to avoid the maximum inrush. RAID5 is great (but Is Not A Backup), UnRaid is a "daily" RAID5... Source: over 1 year ago
As an example, I have qemu+kvm host running my VMs (NAS, plex, Nextcloud etc.). As for NAS OS, TrueNAS is a great options. With different drive size you can consider UnRAID. It allows to pool drives of a different size. https://unraid.net/product. Source: over 1 year ago
You can turn a PC case into a NAS with NAS OS like openmediavault (https://www.openmediavault.org/), unraid (https://unraid.net/product), or TrueNAS Core (https://www.truenas.com/docs/core/gettingstarted/corehardwareguide/). They require +8 GB RAM (Unraid system requirements say 4 and OMV is ok with +1GB RAM). To start, I'd go with openmediavault. If you need it to be windows, say, using for anything else, you can... Source: almost 2 years ago
Take a look at using unraid as a backup server. https://unraid.net/product. Source: almost 2 years ago
In case you are interested in software options. UnRAID is a nice option. Https://unraid.net/product. Source: about 2 years ago
iRedMail - A fully fledged, free email server solution, an open source project (GPL v2).
TrueNAS Core - TrueNAS Core (formerly FreeNAS) is a storage operating system strong and robust enough to meet the needs of enterprise level businesses.
Zimbra - Zimbra is trusted by over 500 million users to increase productivity with a complete set of collaboration tools while maintaining total control over security and privacy.
OpenMediaVault - OpenMediaVault is the next generation network attached storage (NAS) solution based on Debian Linux.
Exim - Exim is a message transfer agent (MTA) developed at the University of Cambridge for use on Unix systems connected to the Internet.
XigmaNAS - File Sharing, OS & Utilities, and Security & Privacy