I have searched an answer open address book click on all contacts , tap one contact to get highlighted , select all of them use command and A key on the keyboard , right click on them and click on export as v card , a pop window will appear its the choice where to export in download folder or at other location ( click on drop down arrow and choose the desired location ) and click on save , screen shots for them .
To import the contacts an article iCloud: Import a contact into iCloud Contacts
Yes the network speed is the the essential part of syncing the contacts , if the user has exceeded free 5gb data and not purchased the data an error will always occur , the user has to reduce the iCloud data an article for it Manage your iCloud storage - Apple Support
And in system preferences - click on iCloud and sign out from the account and archive folder will be created in home folder .
Thanks ! to Joseph and Kareng 12 the respected community specialist and always guiding , if any one is reading it could help .