This condition evaluates true for any database other than model, tempdb and ReportServerTempdb whose last full backup is more than 24 hours old.
Restricted to SQL Server 2012 and higher
Ignores TempDB and ReportServerTempDB databases.
Ignores Read Only databases
Ignores databases in a standby state
Ignores databases identified as a database snapshot
Default threshold is 1 day, please change to meet your own SLA's
Set to check every 4 hours.