did "restrict background data" *per-app* just disappear in an os update? (android 4.2.2) Just noticed this now, I'm pretty sure option was there a few days ago...

now I can't stop Play Store from using up my data. There is now a global "restrict data access" but it doesn't seem to apply to some apps - like the play store

EDIT weird, now they're back again. I think the only thing I did was logout (via about:debug, then setting->debug->reset prelogin, the last one)
The option is "Restrict Background Data" and you can access it on Settings -> Power Saving, after choosing a proper power saving mode. 

To stop Google Play from hogging your data, open the Google Play app settings and look at the "Auto-update apps" option. There is a possibility to only update when connected to an wifi network.