Backup Tapes Come Back to the Homelab

A homelabber recounts setting up an LTO-5 tape drive to show why magnetic tape is re-emerging as an economical option for large cold storage. LTO-5 cartridges hold about 1.5 TB of uncompressed data (advertised 3 TB assumes 2:1 compression that rarely applies to photos and video), and drives come with SAS or Fibre Channel interfaces; a PCIe host adapter makes hooking a Fibre Channel drive to a PC feasible, but simple details like needing a crossover cable when there’s no switch matter. Used LTO-5 drives and cartridges are inexpensive on the secondary market, so the upfront hardware and per‑terabyte costs can beat spinning disks for big archives.

The practical tradeoffs are clear: tape reduces $/TB dramatically (examples cited of ~$2/TB for used tapes versus ~$16/TB for disk) but is sequential, block-oriented storage rather than a filesystem, so restores and tooling require care. Backward-compatibility works up to a point (LTO-5 media usable with some later drives), but newer generations are pulling back compatibility. Software and workflows matter - tools such as tar, Bacula/Bareos or tiering solutions can manage tape archives - and the medium’s repairability (replaceable heads) and historical hacks (VHS/ArVid experiments, robot loaders) make tape a viable, if niche, homelab strategy for long-term, infrequently accessed backups.