How to set up Time Machine or otherwise organize reservations on imac?

Question

Backup

Hello.
I first encountered the issue of redundancy on the OS X system.
Initial data:

• imac472, OS X El Capitan (version 10.11), onboard 1TB Fusion Drive
  
• Seagate Personal Cloud NAS www.seagate.com/files/www-content/manuals/seagate-... , 3+3 TB (mirroring, RAID 1). available space 3TB
  
• imac and NAS are connected via ethernet (but it may be expected and required to connect them via Wi-Fi using Router)
  
• there are two users in the OS: Admin (administrative rights), User (standard rights)
  

Directories created on the NAS:

• Admin (admin user's personal folder)
  
• User (User's personal folder)
  
• IMAC (folder to back up all given files with imac)
  
• Home (shared home folder for those who know the password from it)
  
• Public (shared open folder).
  

Goal (must achieve all points):

• redundancy of the OS itself, the kernel and all functionality
  
• backing up ALL users and their files
  
• backup size limit to 1 TB (may be up to 1.5 TB)
  
• reservation so that it is not done too often, but at least once a week automatically
  
• the ability to reserve a manual stratum for this procedure, while taking into account the maximum possible volume (as it is written above, it is limited from 1 to 1.5 TB
  
• the ability to restore everything above if necessary from a backup
  

How can such a procedure be implemented to accomplish all of the above (maybe a script, freelance or advanced Time Machine settings, additional applications or disk utilities)? From under which OS X account do you need to configure the reservation (from under each or from under the administrator)?
Big phanks for replies and comments

Answer 1

Time Machine only allows you to work with a locally attached drive, but there is one hack. You can install MacOS Server and through it you can connect a remote drive for Time Machine.