hey it's that time again.

do you have data? that you like? is it backed up? do you have automatic backups you've checked are actually happening?

in multiple locations?

have you done a test restore to make sure the backups work?

*even an extra copy on a flash drive is better than no backups*

@NanoRaptor My backups are great and tested tyvm (https://www.alkoclick.space/my-backup-strategy), but maybe some of the storage nerds in this thread can help me: How can I estimate bit rot on a modern SSD (I'll take any model) over a twenty year period of roughly ideal circumstances? I've been searching all day and I'm now down to academic papers proposing arcane optimization algorithms and still I fail. I must be missing something
My backup strategy

I am writing this document for myself, as well as anyone else that’s interested in taking a stab at backing up their homelab tools.

🔮 Enchanted Systems

@NanoRaptor Answering my own question now that I understand the topic a bit better: The closest number to what I had in mind is UBER, Uncorrectable Bit Error Rate and for most modern HDDs and SSD is somewhere between 10^-13 and 10^-16. In practice the actual Raw Bit Error Rate on operations can be as low as 1/1000, but SSDs use a bunch of Error Correction Codes to validate and fix data as they read it, so you end up with the UBER number.

As a fun extra. the question as posed is kinda invalid: SSD longevity, even under ideal circumstances is heavily reliant on the load of read/write operations, so basically the amount of ops translates to SSD age, unlike HDDs.

Refs used:
* Data Longevity and Compatibility
* Data Retention in MLC NAND Flash Memory: Characterization, Optimization, and Recovery

https://web.ece.ucsb.edu/~parhami/pubs_folder/parh19f-ebdt-data-longevity-compatib.pdf

https://users.ece.cmu.edu/~omutlu/pub/flash-memory-data-retention_hpca15.pdf

This and other things about SSDs here: https://www.alkoclick.space/things-i-learned-about-ssds