2 of 2 deleted 26 characters in body

Japt, 46 30 bytes

-16 bytes thanks to Shaggy.

One of the first times I've tried using Japt. The JS eval can be fidgety sometimes. Uses the browser's window.localStorage.

Store (16 bytes)

Ox`lo¯lSÈSge.P=U

Retrieve (14 bytes)

Ox`lo¯lSÈSge.P