Is it possible to move existing databases onto the ninox cloud I just signed up for?
Yes. Export data in your old database tables to csv format. Within Ninox create new tables with matching field names and field types. While viewing the list view of a table within Ninox click the gear icon and select import data. Then select your corresponding csv file, match field names, and import.
I think it would be easier to save the database locally using "Save archive as..." and then import it to the Ninox cloud.
If thats possible I would stick with the ninox cloud.
I tried the archive works perfectly.
I have to decide if I want to use ninox on my local devices and sync via the icloud or switch to the ninox cloud which always requires internet access.