store a copy of the theocbase.sqlite file somehwere very safe. Do that first, so you always have the original somehwere.
Then in TB settings go to 'open database location', close TB (!) and paste a copy of the sqlite file into the folder shown. (I assume there are data in that file...)
Open TB again, hoever over the cloud symbol and choose 'remove data from cloud'. After you have done that, it will immediately ask you if you want to sync. Click yes, and the content of your current theocbase.sqlite will be uploaded to the cloud.