Exclude Specified file url from iCloud backup

isExcludedFromBackup.swift

struct FileHelpers {
    @discardableResult static func addSkipBackupAttribute(url: URL) throws -> Bool {
        var fileUrl = url
        do {
            if FileManager.default.fileExists(atPath: fileUrl.path) {
                var resourceValues = URLResourceValues()
                resourceValues.isExcludedFromBackup = true
                try fileUrl.setResourceValues(resourceValues)
            }
            return true
        } catch {
            print("failed setting isExcludedFromBackup \(error)")
            return false
        }
    }    
}