You should not be using H2 database.
I had no issues with the update and only had to restore my modified config.
So, a complete new created directory created with the unzip and run command, the restore the conf directory will also restore all tracker data and history?
If you are using H2 database then no, but you shouldn't be using it for production.
For the first time I upgraded (successfully) Traccar, from 3.12 to 3.14. I followed https://www.traccar.org/upgrading-traccar/ . I think between step 4 and step 6 the step 'restore files in data/ directory' is missing. Correct?