Problem

AMP operation log does not contain entries for whether scheduled backups were completed successfully or failed.
For scheduled backup the 'backup_taget' is not returned as part of the GET response

Solution

Made changes to add the audit log entried for both backup and restore
For scheduled backup made changes to store the backup_target in DB and show the it as part of REST API response

Tested that operation log is getting displayed in System->Administrator->Operation log

For scheduled back up GET response now contains 'backup_target'
{

    "day_of_the_month": 17,

    "month": 4,

    "frequency": "yearly",

    "time": "17:56",

    "day_of_the_week": null,

    "backup_target": "remote"

}