DataLocker products that use NAND for storage are great for backups that are maintained over the years, but NAND is in general not an archival-type medium.
The standard for NAND is governed by the organization JEDEC. DataLocker uses the highest quality NAND components from leading manufacturers that meet the JEDEC qualification standards.
This being said, all NAND flash degrades with usage (amount of data written measured as TBW Terabytes Written) and time and the data retention that can be expected is a dynamic number that normally range from 10 years to as low as 3-12 months (the low range is at the end of the specified JEDEC life cycle test and max TBW).
In general, the longest data retention is achieved with:
- Storage temperature (lower is better)
- P/E cycles (less usage, less Programming/Erase is better, less Terabytes Written is better)
- Usage temperature (lower is better)
- Refresh storage periodically (power up/unlock drive on a schedule for a few hours to allow the storage controller to maintain storage cells)
Additional reading:
http://www.jedec.org/sites/
https://www.vikingtechnology.