The Note app started deleting my notes over 30 days old. How can I keep until I delete?

The only place that a note would delete after 30 days is in the Recently Deleted folder. Regular notes will not auto-delete, just the ones that you have deleted will automatically delete from the Recently Deleted folder. After that 30 days, they are permanently deleted. That is just like photos that are in their Recently Deleted folder. They stay there for 30 days, in case you didn't mean to delete them, then they are permanently deleted.

Hello,

Notes will not automatically delete any of its contents.