Comment by e2le

>digital files can easily be removed

Keeping only a single copy seems insane to me, any number of things could go wrong and destroy all that's stored there[1]. Digital copies wouldn't so bad if there were redundant backups (tape[2], film[3], etc.).

[1]: https://www.cbsnews.com/newyork/news/nypd-warehouse-fire-evi...

[2]: https://www.ibm.com/tape-storage

[3]: https://archiveprogram.github.com/