My project is CoreData-based application. Is it enough to upload sqlite-file to CloudDrive for restoring data when need? Is there any tutorials how to implement it?
Nothing for you to do. Just enable iCloud and it will always be backed up and restorable automatically.
See Enable iCloud with Core Data. It's really simple.
来源：https://stackoverflow.com/questions/30886331/full-coredata-uploading-backup-to-icloud-drive-and-restore-if-need