Chrome Extension - Write & Read Backup Data - IndexedDB

Hello, I need something very straightforward. I already have a functioning Chrome extension, however, I'm not familiar with Writing data offline, and retrieving it later. What I want is simply this: 1) I'll have a variable I generate via Javascript (JSON, Array, etc..), I want this Chrome extension to write that data locally, to be accessible later. I'm not familiar with the best storage methods, but upon quick research, "IndexedDB" seems recommended? 2) I'd like this data to be stored in 2 distinct groupings (but same format of data). (Click Extension Drop/Pop-up, press Save option) a) Manual Save - Each time the user clicks a button, a copy of the variable/JSON data is saved locally. A Text-Box is shown with an Auto-Generated name (Timestamp) for that save instance, the user can edit the name text before clicking save, for easy reference. (Show confirmation notice of save success) b) Auto Save - Every x Minutes/Hours, the Chrome extension automatically saves a time-stamped copy of the same data. (No need for confirmation notice, occurs quietly in background). 3) This saved data should be easily accessible afterward. Clicking the same Chrome extension Popup/Drop-down, there will be a button/link named "Restore Data". Clicking that shows a page (in the same pop-up), with a list of all saved states of the data. There will be x2 Lists (parallel to each other, if there's room, or stacked if there's not enough width). The user clicks on an instance from the list, and the data is called back into the Chrome extension (I use JS here to apply as needed, you can "[login to view URL]" write as test). 4) Allow the user to "Save File" the data, where they see the regular browser "Safe File" prompt, and can save that data as a file, anywhere they choose. 5) Allow the user to "Restore data from file", basically the reverse of step 4. They get a browser prompt to locate a file, when selected, we pull the data for use ([login to view URL]). That's basically it. 1 & 2) Write data/JSON/variable to locally (maybe IndexedDB). Manually + Automatically. 3) Restore that data ([login to view URL]) via a simple interface, presenting the locally saved instances of the data. 4 & 5) Write & Read data to/from file, manually. I already have an existing Chrome extension which I will import these functions into, so please, don't make the code too complex, as I want to be able to use it in my own extension, rather than a stand-alone extension. Thank you, Andrew ----- Sorry for the delay in responding to project applications, I was occupied for the holiday week. I'll be reviewing applications very soon. Thanks, Andrew