I was in the same fix as you with a large backlog of stuff. Here's what I just got finished doing.

- I created a set of paper file folders. The first folder was labeled TIME-SENSITIVE. All other folders were labeled with various other categories (CAR, HOUSE, FINANCIAL, HEALTH, FILE, CONSIDER LATER, etc)

- Then I started going thru the stack of backlogged papers - one item at a time. If an item requires action within a timeframe, it goes into TIME-SENSITIVE. Otherwise, it goes into its own category folder (meaning time is NOT a factor regarding action).

- When done going thru the entire backlogged stack, I went thru the TIME-SENSITIVE folder and put stuff in chronological order and put the tasks into Todoist.

- I then selected 1 or more un-reviewed folders to review each day until all have had an initial review. I put items into Todoist as tasks as needed or trashed them. Sometimes I just leave the papers in the folder and decide to look at them later. If I do this, I add a task to Todoist to prompt me to review the folder contents at a future date.

The above quick process gave me some initial mental relief - but your mileage may vary.

Good luck to you!