AT&T MERLIN LEGEND Release 3.0 System Programming And Maintenance Manual page 47

Using SPM
The release number is found
identification number. For example, 0300 = 3.0, 0201 = 2.1.
If the backup file is compressed, you can read the header but you cannot
read the data area following the header. Use type [backup filename] to read
the header on a DOS system or
a UNIX System.
Note that the communication system release number,
of SPM, reflects whether the backup
Release 1.0 backups are uncompressed and Release 1.1 and later backups
are compressed. Uncompressed files take longer to restore.
Considerations
Review the following items before you begin the backup procedure:
The communications system does not have to be idle during backup;
however, extension programming is blocked.
Any objects that are in a maintenance-busy state are stored in that
state. When you restore system programming, these objects are
busied out, even if they have since been released from the
maintenance-busy state.
If you plan to store your backup file on a diskette, format a DOS
diskette. (DOS formatting can be done on a UNIX System PC or a
DOS PC).
Uncompressed backup files are 100,000 to 210,000 bytes in size;
compressed files are about 70,000 to 85,000 bytes.
Maintenance data (error logs and other data used by qualified service
technicians) is not saved in the backup file.
Follow the steps
in the first two bytes (four characters) of the
cat [backup filename] to
below to perform the backup procedure.
System
not the version number
file is compressed or uncompressed.
Programming and Maintenance (SPM) 29
read the header on