The free plan over at openshift only allows 3 "gears" which you know is a bit of a problem if you have more than 3 apps to test... don't sweat it tho, simply backup your gear, delete it and re-use the free slot for something else ... if you need the gear back as long as you re-create the app with the same name you can restore the snapshot..

To backup your application code, data, logs and configuration, you run:

$rhc app snapshot save -a {appName}

To restore your application, you run:

$rhc app snapshot restore -a {appName} -f {/path/to/snapshot/appName.tar.gz}

REF: KB-E1047

Enjoy!