---
title: "22-digital-preservation"
aliases: 
tags: 
- comp210
- lecture
---

how long will data survive?

data rot
- eveything wears out
- digital media degrades
	- unreadable media
	- damaged files
	- backups may help
- hardware and software becomes obsolete
	- cloud service shut down
	- os no longer exists
	- no device to read media
	- no software to read files
- format documentation non-existent or missing
- file system changes - lost metadata

![how long will it survive table](https://i.imgur.com/I8sY6FV.png)

Dark ages 2
![](https://i.imgur.com/VPOtcgf.png)


## preservation of digital material
- continuous format migration
	-