Contacts Backup funktioniert nicht

Restore your contacts in address book using your backup file in app. - Easily transfer contacts between iOS Devices using just email client, Message... - Store your backup data to Dropbox, Google Drive. - Support File Sharing: connect your device to your computer.  No need to use any app to restore backup file. Just tap on the *. vcf backup file in the iPhone, iPod Touch or iPad Mail client and restore your contacts for FREE. - In App vCard Restore Feature.  All contacts can then easily be restored any time by simply opening the . vcf file in your mailbox with iOS Mail app or using default Message app for importing contacts. ● I have too many contacts, is there any limit for backup? There is no limit.  All photos attached to contacts are backed up in vCard (. vcf) format. - Fast delete unwanted contacts by swiping to delete. - Add contact to group, create new group, remove or rename group. - Offline Backup.  But more contacts can increase the backup file size and the processing time. ● I have added photos to some of my contacts. Are they backed up too ? Yes they are.  Backup and restore your contacts right from your phone without the need for a computer or synchronization.  You can backup all your contacts with a single touch and send them to yourself as a VCard attachment via email.  Just email the backup file to yourself. 
- Easy Restore.  We have tested the application with over thousands contacts.  No need to sync to any server.  You can take the backup file and save it in a safe place.