HOWTO | set up Time Mac hine in OS X Server
1 Create user accounts
Open Server from the Applications folder. Select Users under Accounts, then click + to set up an account for another person who wants to back up to the server. Match their full name and account name to the account on their Mac. Set the Home Folder option to ‘None – Services Only’, then click OK.
2 Choose who can back up
Optionally, you can restrict which accounts can back up to the server. Select Time Machine under Services, then click Edit next to Permissions and select ‘only some users’. Click the ‘+’ and enter the name of a user you want to grant access to the service. Repeat this for all users who need it.
3 Pick a destination for backups
With Time Machine still selected under Services in the left-hand pane, flick the switch in the top-right corner to ‘On’. You’ll be prompted to choose a destination for your other Macs to store their backups. Click ‘Choose…’ to select the drive and folder you want to use.
4 Set storage limits
You can prevent Macs running OS X 10.9 or higher from using up all available space by enabling ‘Limit each backup to’ and choosing the maximum capacity an individual Mac can use. 500GB is suggested by default; lowering it limits how many backups (and file versions) each Mac can keep.
5 Ready for action
Time Machine’s status will indicate your Mac is now able to act as a Time Machine target for other Macs on your network. Switch to another Mac, open System Preferences > Time Machine and click Select Backup Disk. Your server Mac should be listed. Select it and click Use Disk.
6 Authenticate and back up
Your server Mac will ask for authentication – this is the username and password you created in step one, so if the username matches that of the local user account, it’ll be entered by default, leaving you to simply enter the password. Click Connect and this Mac will use the server for its backups.
7 Monitor and manage
Once the service is up and running, go to Services > Time Machine and switch to the Backups tab, where you’ll see a list of connected Macs and the status of ongoing and complete backups. Double-click one to reveal more details about it, or right-click for an option to irreversibly delete it.
8 Manage storage
Server’s Time Machine capabilities are scalable. If it runs low on space, plug in a new drive and click the + button on the Settings tab to set it as a destination for your Macs to use for backups. Note that multiple drives can be used for backups; Time Machine will use all their available capacity.