diff --git a/content/notes/22-digital-preservation.md b/content/notes/22-digital-preservation.md
index f967052e1..c188c2e6b 100644
--- a/content/notes/22-digital-preservation.md
+++ b/content/notes/22-digital-preservation.md
@@ -4,6 +4,9 @@ aliases:
 tags: 
 - comp210
 - lecture
+sr-due: 2022-10-13
+sr-interval: 3
+sr-ease: 250
 ---
 
 how long will data survive?
@@ -30,4 +33,37 @@ Dark ages 2
 
 ## preservation of digital material
 - continuous format migration
-	- 
\ No newline at end of file
+	- everytime you upgrade software, convert all documents
+	- document changes, keep old versions
+- emulation of olf hardware
+	- open things in original evironment
+
+- standardised preservation formats
+	- pdf/pda
+	- not designed for convenient editing
+
+- dont know original format?
+	- lots of tools, but user unfriendly and somwhat limited
+	- need to find version and which software
+
+- in cloud
+	- e.g., social media, websites
+		- things are changing
+		- acquisitions, bankruptcy
+		- link rot
+	- internet archive
+		- aims to archive everything
+		- crawl websites (wayback machine)
+		- digitise of magazines and films
+		- over 100 petabytes
+		- controversy over copyright
+		- only static content
+- most national archive organisations are doing similar
+- not eveything is accessable
+- some services let you export your data
+
+what happens when you die
+- or stoke etc
+- few legel precedents
+- prohibit giving password to someone else
+- "memorialise an account"
\ No newline at end of file
diff --git a/content/notes/comp-210.md b/content/notes/comp-210.md
index d7230437d..0ed414914 100644
--- a/content/notes/comp-210.md
+++ b/content/notes/comp-210.md
@@ -42,4 +42,4 @@ No final exam
 - [19-deepfakes](notes/19-deepfakes.md)
 - [20-SE-in-IA](notes/20-SE-in-IA.md)
 - [21-SE-in-IA-2](notes/21-SE-in-IA-2.md)
-- 
\ No newline at end of file
+- [22-digital-preservation](notes/22-digital-preservation.md)
\ No newline at end of file