Conflict File - Server - clint

Hi, i had often conflict Files from our DB-File. Sometimes it changes on the desktop PC (we work on it) and nextcloud shoult save the Folder with all Files to the Cloud (Backup only) - sometimes it came conflict and he rename the DB-File and download the old backup (maybe 1-2 Days older than Desktoop version).
And we start to work in the old DB File.
Its no other Clint load backups to cloud an no one works online in the cloud. so the cloud is only for backup use. why we become sometimes conflict Data-Files and than the old Backupfile n the Desktop from the server cloud?

Can i stop download so Nextcloud clint is only uploading files ?

hope my english is good to understand the Problem?