Sorry, must have pressed Post Reply too soon!
Still in Caja, navigate to where you store your Timeshift snapshots. One of mine has a folder in its Snapshots folder called
2019-01-20_12-49-01
... so that was taken at 12:49PM on 20th January.
While you are identifying that New Essential Data, you can use List view (default might be Icons) to show full details and at right where it has Date Modified, click that header and you can toggle between newest or oldest chronologically. Compare that against the date-timestamp on your Timeshift snapshot, and you will have a good chance of capturing all that data.
Save the data elsewhere, then run a Restore from Timeshift, return the data to where it was, and you are good to continue
OR
POSSIBLE SOLUTION 2 - FAR MORE LIKELY
These Posts after remembering something I encountered.
See screenshot below
WIZARD'S TESSA MATE DESKTOP WITH WINDOWS OPEN AND MINIMISED
Betcha what you are looking for is those minimised windows??
Tricky problem with simple answer.
In my panel I have menu followed by 4 icons, 4th is Firefox.
I have Synaptic Package Manager, FF, Terminal and GParted all open and minimised.
Then I have a bunch of other icons, first being Timeshift, followed by GParted, GTKHash, Synaptic &c.
Over to the right, I have manually moved my Solitaire (red heart on playing card) and between them is Workspaces.
At far right is System Tray.
I am betting you have a "middle" bunch of icons by now, and if you imagine on your middle bunch they start with Firefox and Chrome where mine are Timeshift and GTKHash,
your bunch of icons are flush against the left-hand bunch. Yes?
When I had that sort of setup, the solution was to manually move the middle bunch to the right (right-click each and move).
Then the minimised windows reappear!
This is a bug that only happened I think with 19.1, maybe 19.0 - I have not reported it.
If this is the case with you, then your minimised Browser sessions are hidden, and each time you click on your FF or Chrome icons, you are launching a new session with no tabs open or new tabs available.
So try moving those icons and report back.
BTW all the stuff in Solution 1 is valid for other troubleshooting purposes
Wizard