Easeus Todo or Macrium Reflect Free or Paragon Backup and Recovery Free will do individual machines.
But they are free for Home Use. Check licence agreement for work.
They, in conjunction, with a Boot Disk that you make, will restore each machine.
(You would need to make Marcium or Easeus PE discs to restore from Netwrok, dunno about Paragon)
But that's only to get a machine bootable. You should have Network Backup as well for day to day stuff.
Also, once a month is rubbish and is not Industry Standard. Should be every night. And off-site backups. I can't advise on that.