Backup on network drive

[mind_fakiyan]

Hello everyone. Before moving to El Capitan I clean my MBA. Of course Time Machine settings reset, and I can't connect. Now I can't setdestination,

MacBook-Air-mind_fakiyan:~ mind_fakiyan$ sudo tmutil setdestination [-ap] smb://mind_fakiyanasspass@192.168.1.1/mac_backup/
Password:
Usage: tmutil setdestination [-a] mount_point
tmutil setdestination [-ap] afp://user[ass]@host/share
MacBook-Air-mind_fakiyan:~ mind_fakiyan$ tmutil setdestination [-a] afp://mind_fakiyanasspass@192.168.1.35/mac_backup/
tmutil: setdestination requires root privileges.

How can I activate privileges? When I set up Time Machine on Yosemite - system didn't ask privileges and afp://...