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Granit — Offsite Backup Device
Custom carrier board for the Raspberry Pi CM4 Compute Module, designed as a minimal offsite backup appliance.
Overview
A compact, headless device that connects to a remote network and receives encrypted backups onto an attached hard disk. Designed to be left at a trusted offsite location and managed remotely.
- Raspberry Pi CM4 with PCIe SATA (ASM1061)
- 2.5" or 3.5" HDD/SSD support
- Software-controlled HDD power (GPIO)
- RTC wake for scheduled backups
- USB-C OTG for eMMC flashing
- Hammond 1455 aluminium enclosure
Roadmap
- v0.3 — First production run (CM4, 4-layer PCB, JLCPCB)
- v0.4 — Fix wake/shutdown latch (#31), barrel jack swap (#40), DF40C alignment bosses (#37)
- v1.0 — Validated design with custom OS image and documentation
- Future — Investigating RISC-V SoM support for a fully blob-free variant
License
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