Summary of "LGR Oddware - Danmere Backer VHS Hard Drive Backup System"

Overview

The Danmere Backer (Backer16) is an ISA-card PC hard-disk backup system that encodes computer data as a monochrome composite video signal so data can be recorded to VHS tapes. Marketed around 1996 by Danmere Limited (England) as an ultra-cheap backup option (roughly $60 US new).
Uses only video (no audio), supports NTSC or PAL composite, and claims about 1.5 GB capacity. Practical results reported between ~750 MB and ~3 GB depending on tape, compression and settings. Claimed transfer rate: 9 MB per minute (~150 KB/s).
Later versions included an external parallel-port Backer and a Backer32 card advertising up to ~4 GB.

Technical / Feature Summary

Hardware
- ISA card with composite video IN/OUT connectors.
- Configurable via jumpers / I/O address options.
- Uses DMA for data transfer (configurable to DMA channel 1 or 3).
Software
- Ships on floppy(s) with Windows 3.1–era drivers.
- Utilities for health check, backup, verify and restore.
- Creates a .SLG descriptor file for tape contents.
Recording format
- Analog composite monochrome video.
- Recorded tapes show visible header/footer frames and file-by-file video segments.
Intended audience
- Budget users seeking very cheap, high-capacity removable media (VHS tapes cost a few dollars versus expensive tape cartridges).

Comparisons and Context

Similar contemporaries and influences
- Amiga Video Backup System.
- Russian ArVid ISA cards (Zelenograd).
- VHS-distributed software compilations (e.g., groups like Transcom).
Market pressures
- Arrival of Zip disks, CD-R/CD-RW, and rapidly cheaper/higher-capacity hard drives made VHS backup an unattractive mainstream option.
Company history
- Danmere later reorganized as 4TV Limited and worked on set-top box software; the company dissolved in 2014.

Practical Notes (Installation, Operation & Troubleshooting)

Unboxing

Typical contents: the ISA card, floppy with software (including Windows 3.1 drivers), printed manual and registration paperwork. The card appears to rely on host software for much of the work (minimal onboard processing).

Installation steps (typical workflow)

Install the ISA card into the PC and connect composite OUT → VCR IN and composite IN ← VCR OUT.
Install the Backer software/drivers (Windows 3.1 drivers were reliable in the reviewer’s tests).
Run the Video Health Check to verify DMA/I/O configuration and signal quality.
Put the VCR in record mode, start backup in the software (writes header, file blocks, footer). To restore: play tape and use the restore utility.

Common issues encountered

DMA conflicts
- The card requires DMA channel 1 or 3; conflicts can occur with sound cards and parallel-port ECP mode. Conflicting devices may need reassignment or disabling.
Reliability
- Analog composite signal and lower-quality long-play tape modes (e.g., SLP) reduce fidelity. Some setups experienced failed restores while others (e.g., Windows 3.1 on a 486) completed full backup/restore successfully.
Troubleshooting steps tried
- Tape head cleaning, swapping cables, trying different tapes.
- Changing compression and redundancy settings.
- Altering block size and transfer speeds.
- Moving the card to different ISA slots and changing DMA assignments.

Other practical tips

Use a high-quality VCR and good composite cables.
Prefer lower-capacity (higher-quality) tapes for better reliability.
The format is analog, so in principle other composite-based video recorders (Betamax, MiniDV via appropriate converters) might work, but they were not tested in the review.

Assessment and Conclusions

The Backer is a clever, low-cost hack for removable storage that can be functional in the right vintage environment. It’s niche and fragile: analog signal sensitivity, configuration complexity (DMA/I/O), and competition from cheaper, more reliable digital media limited its adoption.
Today it’s a rare collector item and an interesting demonstration of analogue-data storage techniques and retro backup workflows.

Main Speaker / Sources

Presenter: LGR (host of the LGR Oddware episode).
Product / Manufacturer: Danmere Limited (Backer / Backer16).
Other referenced systems / sources: ArVid (Russian ISA video backup), Amiga Video Backup System, Transcom (VHS software distributions).