That 90 days figure applies only to SSDs that have worn out their entire rated write endurance, and only to enterprise/datacenter SSDs. For client/consumer SSDs, the standard for unpowered data retention at the end of life is one year (at 30°C, compared to 40°C for enterprise drives). That longer retention requirement is one contributing factor to consumer SSDs being rated with lower write endurance.
In practice, hardly anyone uses up the entire write endurance of their SSD, especially not if they're using it to store backups, archives, or other relatively static data. Flash memory that isn't worn out has much longer retention times.
In practice, hardly anyone uses up the entire write endurance of their SSD, especially not if they're using it to store backups, archives, or other relatively static data. Flash memory that isn't worn out has much longer retention times.