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226 Chapter 10 Managing Preferences
Time Machine is most appropriate for backing up computers with primarily local
accounts. It is also useful if users have administrative control over the computer and
can install their own applications.
You can limit the total backup storage per computer. When you limit total backup
storage for a computer group, the limit applies to each computer in it. If you limit a
computer group to 2 GB, and the computer group has five members, the computer
group can use up to 10 GB of backup storage. Backup storage is not preallocated, so
the server can run out of space before the computers reach their backup storage limit.
If a user runs out of backup storage, Time Machine stops backing up data. To make sure
Time Machine doesn’t run out of space, make the limit larger than the expected size of
the data being backed up, and don’t back up system files.
You can save space on the file server by not backing up system files. System files
include files that are created when Mac OS X is installed. If you don’t back up system
files and system files are corrupted, you must use the Mac OS X Server installation discs
to reinstall Mac OS X Server. By not backing up system files, you speed up the initial
backup but you don’t speed up subsequent backups.
To manage Time Machine preferences:
1 In Workgroup Manager, click Preferences.
2 Make sure the correct directory is selected and you are authenticated.
To switch directories, click the globe icon. If you are not authenticated, click the lock
and enter the name and password of a directory domain administrator.
3 Select one or more computers or computer groups.
4 Click Time Machine.
5 Set the management setting to Always.
6 In the “Backup server” field, enter the URL of the file server or share point that will store
Time Machine backups.
Use the form afp://www.example.com/Backups/.
Replace www.example.com/Backups/ with the URL of the file server or share point. The
location you enter must already exist.
7 To select which volumes to back up, select “Startup volume only” or “All local volumes.”
8 To back up system files, deselect “Skip system files.”
9 To use automatic backup, select “Back up automatically.”
10 To limit backup storage, select “Limit total backup storage to: # MB” and replace # with
the number of MB to limit backup storage.
11 Click Apply Now.