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For this idea these programs came up: LuckyBackup, Back in Time, kdar and rdiff-backup (with a qt-gui) . Here's a short overview to get the pros and cons of all programs listed and make a suggestion to improve one of them to be included into kde.
luckyBackup and B-I-T are...

* Both have backup and restore capabilities
* Both have filter options to exclude certain files
* Both are rsync based
* Both are not suited for backups on fat-formated devices (blame fat for this)

luckyBackup

* Fully Qt4 based
* Interface is cluttered and difficult to understand for first time usage but gets an update in april (according to luckyb, the author)
* The author welcomes this idea, is active in this forum and want to help/is motivated to do the necessary things

Back in Time

* Much better interface for configuration
* Smart option to remove backups (like TimeMachine)

'dar' with its frontend kdar.
Advantages:
* real backup (big files, permissions, etc.)

There already is a backup tool for Plasma: Kup.
Of course if an author of another backup tools would want their project to become a KDE application, they are welcome to contact the Developers: https://community.kde.org/Get_Involved/ ... h_the_team