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TSM Usage and Charging

The primary goal of the TSM backup service is to protect users' personal work from loss due to hardware failure or inadvertent deletion. To focus the service more directly on that goal, and assure that TSM resources will be adequately matched to demand, OIT has established policies and associated charges for the TSM backup service.

Backing Up Only Personal Data

Personal work documents stored on faculty, staff and graduate student workstations will be backed up at no charge and with no limit on size. TSM service is not available to Undergraduate students. They are encouraged to use shared network storage for important data.

The definition of personal documents will be based on the location of the documents, for example the "My Documents" and "\usr" folders on a Windows NT or Windows 2000 systems. See the appendix of this document for a complete description of what will be backed up on each operating system.

Undergraduate students are provided with 5 GB of shared network disk storage where their data will be protected by two different backup/restore capabilities. Self-service recovery of individual files that have been deleted or damaged will be provided by the shared storage server using a "snapshot" technology, which maintains copies of changed or deleted files in a special storage area on disk. TSM backup will be used to guard against catastrophic failure of the entire shared storage system. For more information on OIT's network disk storage service, see the Knowledge Base article at http://www.princeton.edu/files.

Complete Backup

For those systems that need backup service beyond the personal documents directories, a complete backup option is available for a fee of $5.00 per month. This complete backup service encompasses all directories on all disk volumes, with the exception of a few such as Temporary Internet Files and other similarly temporary directories. An $5.00 fee will apply for any system whose total TSM occupancy is less than 150GB. Since data is compressed before it is stored on TSM's tapes, the 150 GB limit represents a much larger occupancy on a user's disks. Usage above the 150 GB limit will be charged at $.50/GB month in addition to the $5.00 charge for complete backup. Computers participating in DeSC (the Desktop Systems Council), because of their special standardized software, will continue to receive their regular backups at no charge.

Some departments store their users' personal work on a central server, and therefore do not backup individual workstations. To accommodate this situation, OIT has defined a mechanism for pooling a nominal backup entitlement across a set of unbacked up workstations and a central server. The department will identify a set of user workstations and the server being used to store the data from those workstations. A credit of 5 GB for each unbacked up workstation will be subtracted from the total occupancy of the server, and the standard charge will be calculated on the remaining usage.

Bulk Backup

For users and Departments that wish to store large amounts of data, the Complete Backup policy may not be cost effective.  These users and Departments may wish to use the Bulk backup service.  This service is geared towards the backup of up large quantities of data (typically many terabytes) at a reduced rate but with a restricted service.  The restrictions on the service are:

  • The bulk backup service is primarily intended for recovering from a disaster situation and does not support casual restoration of individual files.
  • The primary backup storage medium will be magnetic tape.  Tapes used to store bulk backup data may be stored outside the main TSM library and may not be immediately available without prior notice.
  • There will usually be an assigned window for the user to perform her backups.

The cost of this backup service will be $15 per terabyte per month.  There will be a minimum charge of $15 per client system for users of this service.

For more information about the bulk backup service please contact tsm@princeton.edu.

Selecting a Backup Option

To choose either the "Personal" or "Complete" option, the TSM contact for a system can go to the TSM Administration link on this web site, choose "Maintain your TSM account" and select a service level. A project-grant number is required in order to choose the Complete option.  A department administrator who wants to specify backup service levels for a large group of machines can send a list of system names and options to tsm@princeton.edu.  Those wishing to use the bulk backup service should contact TSM support at the above address, or contact the Help Desk.  Bulk backup cannot be selected by self-service.

Appendix: Definitions for Personal Data Directories

Operating System Personal Directories
Window Vista C:\Documents and Settings, C:\Users, D:\Users, C:\usr and D:\usr.
Windows 2000, XP, 2003 C:\Documents and Settings (including My Documents) for all users except \Default User, \LocalService, \NetworkService, \SMSC; also C:\usr and D:\usr.
Windows NT C:\Winnt\Profiles
Windows 9x C:\* (there is no consistent personal directory for Windows versions prior to Windows NT)
Linux, Solaris, Irix, AIX /home,/home1,/home2,/data,/data1,/data2
Macintosh OS 10.x /Users
Macintosh OS 9.x and earlier Back up entire system. There is no defined directory for personal documents.