Unable to save Data Backup settings
Issue Description
User feedback that when click on [Save] button under System > System > Data Backup it failed prompting " Operation failed. Backup settings parameter is invalid.
Error/Warning Information

Handling Process
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Tried to uncheck some options from Data Backup to see if it’s existing configuration causing issue, but after uncheck all modules it is still not able to save.
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Checked on browser debug, did not found any obvious errors but can be certain that it is somehow related to the parameters used.

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Check on backend logs, it shows "Illegal backup setting parameters"

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Check the syslog.ini file on ES Manager backend. Path : /ac/dc/config/syslog.ini

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Noted the disk_crypt_log value is undefined.
Root Cause
Known bug, it is resolved in newer version of 3.7.2 (older build of 3.7.2 has the problem exists.
Solution
Modify the following line:
disk_crypt_log = 0
