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\%Y-\%d-\ represents a directory and %m.dmp represents a file. Y and d are variables. The variables are used to be able to run the command as part of a program or loop.
For example %Y could represent an array of home directorys
The %Y, %d, %m are all options to the date command they represent year, day, month, respectively. They can be demarcated by a handful of ASCII characters, these are listed in date(1). They have backlashes because they have been escaped.