Dropbox Integration & Database Synchronization

DROPBOX INTEGRATION : We have two buttons one for upload backup to dropbox and other for restore uploaded backup . Upload Backup There is a folder called "ABC" in documents folder inside device which contains images, csv files, database file and subfolders . Now this "ABC folder should be uploaded to dropbox Restore Backup When restore button clicked i want that same folder to download and copy to my documents directory. DATABASE SYNCHRONIZATION 1) Sync data between two ios devices via bluetooth (Database file is in format .db ). Eg : Pair devices by bluetooth and transfer file from device 1 to device 2 and Sync the database records Note: Two database files are in documents folder of respective devices and with same file name, tables and columns Note: Before adding records from device 1 to device 2 check record exist already or not to avoid duplications.