enque/backup_disabled is a SAP Parameter attribute which is used to control Disables writing the backup file information. This is available within R/3 SAP systems depending on the version and release level.
Below is the standard documentation available and a few details of the attributes values .
If this parameter is set to TRUE, the system does not write an enqueue
backup file. This means that when you restart the system, updates that
had not yet been processed take place without lock protection. At worst,
this can lead to inconsistent data. The advantage of this procedure is
that it improves system performance.
See SAP Parameter Documentation for full SAP documentation for this profile parameter.