Thanks for the clarification, Mathias!
Regarding the backup of Findings data, it’s all contained in the ‘Default’ folder that’s either in Dropbox or in your local ~/Library folder (within Containers/com.findingsapp.findings). The export functionality will only export the selected entries (experiments in Findings 1, with the option to have them all), or the selected protocols. In Findings 2, this will not include the collection data. To have a complete backup of all your Findings data, you can instead make a copy of that ‘Default’ folder. After resetting your apps on all the devices, you can then simply drag that entire folder into the Findings icon on your Mac, which will import back everything into whatever setup you now have (Dropbox or local).