Backup and Restore instead of initial sync?

[KC_20CY]

@dpoulton

2 - Reset ALL local data

However if you really want to "reset" your local client you can do the below and it will reset everything.

1. Fully QUIT Joplin. File > Quit
2. Rename the folder C:\Users\Username.config\joplin-desktop to something like C:\Users\Username.config\joplin-desktop-old
3. Start Joplin
4. Joplin will create a new joplin-desktop folder and a new local database within that folder. It will be as if Joplin was just installed, with no plugins, no customisation and only the default "Welcome to Joplin" notes. Joplin will not be connected to the sync server (Dropbox).
5. Delete the welcome notes if you want to.
6. Go to the sync settings in Joplin and connect the client to Dropbox just as you did before.
7. Let the client pull down all the notes. If you have a lot of notes and many large attachments this will take some time.
8. Do not delete C:\Users\Username.config\joplin-desktop-old until you are happy all is working correctly.

3 - As option 2 but with an uninstall / reinstall

Between steps 2 and 3 above, uninstall and reinstall Joplin

You now have a fresh Joplin install with a fresh copy of your note data from your sync server. Whether this fixes your problem with tags is another matter.

This part of provided suggestions are pretty helpful. I am still in the process of digesting them. Do you have any insight in regard to the scenario 1 that I mentioned in this thread?

@KC_20CY

Scenario 1, If I am in a situation of this thread subject, and I import data from my local backup file and deleted all data on Dropbox cloud storage and sync everything new up to Dropbox, in such case, nothing will be repeated, would this work?

I am trying to avoid the time waiting for cloud-to-local sync time because I have 25000+ notes, I stored my notes in a complicated folder tree following specific ontologically taxonomic method/directive, and the cloud-to-local sync only conveyed me the folder tree at the ending time of three-days sync process, which means, I practically can not access the taxonomic resources during the wait.