all data deleted from database?

hi, i've had a contact database for a week now, i suddenly got a server unresponsive error which was continuous, so i x'd out and reloaded ninox.... now 200 fields of customers have been deleted from my data base??????? how has this happened? i didn't manually delete them

and why isn't there a 'save' option that i can see on the cloud/web version??

as i have purchased the cloud for 3 users, do i have to also purchase the app for mac? i'd like to work from the app instread of the web

anybody help????

You should have a backup - go to manage backups and restore the latest one before the data was lost