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* Proxy Cafe: the backup edition
* 
No better day to talk about disaster recovery

[[https://old.reddit.com/r/AskHistorians/comments/176wcxp/what_important_data_documents_or_information_was/][1]] [[https://old.reddit.com/r/sysadmin/comments/16fw1j4/how_did_911_affect_you_as_a_sysadmin/][2]] [[https://old.reddit.com/r/sysadmin/comments/d3a3ei/911_it_story/][3]]

* What is a backup
- not "DCIM2568 - Copy.jpg"
- not a snapshot
- not an archive

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The only defense against:

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- hardware failure, theft, loss

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- [[https://lezzo.org/copypasta/#rotational-velocidensity][+Rotational Velocidensity+]] bit rot

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- ransomware infections

** Code red stories
[[./batman.jpg]]
** What do you need to backup?
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- your laptop
- your server
- your mobile phone
- your work laptop
** 
[[./bus.jpg]]

* 
Not all files are created equal
** 
It's a matter of life or death
[[./chrome.jpg]]
** 
Press F to pay respect
[[./borderlands.png]]

**  
I cry but I'll live
[[./please_seed.png]]

** 
You forgot you are supposed to be an adult
[[./uk.png]]
** 
Bonus: things that you suppose are always available
* 
Software features
- Versioning
- Incremental backups
- Deduplication
- Compression
- Encryption on transport
- Encryption at rest
- Error correction
- Consistency
** 
What about the hardware?

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- go to +the cloud+ someone else's computer
- buy a NAS 🤮
- buy a DAS and make a NAS 😎
- buy hard drives and put them under the bed
- +dvd+ blu rays
+ tapes (lol)
** 
[[./terra.jpg]]

** 
Things that get confused for backups
- file synchronization
- raids

* A few rule of thumbs
** 
Either you save money or you save data
[[./dropbox.png]]
** 
The 3-2-1 rule
** 
Always test your backups
[[./spongebob-haiku.jpg]]
** 
Go low tech
[[./collage.png]]