What happens to the object lists after an ECTR client update?

Hello community,
we plan an update of the clients from ECTR 5.1.9.3 to ECTR 5.1.14.
Now the question:
What happens to the object lists and the documents they contain?
Where are these stored and are they still available to the user after the update?
Or can/must I export or save them?
Thank you very much for your support.

Yours sincerely
Werner Riel