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[quote:] i saved package name and Key password and Keystore password on my pc, then i backup the project and try to retrieve previous backup that i made yesterday[/quote] did you delete original project?
yes i did but i took backup before. and the keys.
The problem is that except keys and password you also need certificate file and it's not possible to extract it on your end. It's also impossible to restore this information if the project was deleted or even from the project backup (because while creating project backup it generates new certificate file). We'll check perhaps your project is saved in our DB and we can restore it, but it takes time.
Could you tell us name of original project you've deleted?
Ok thanks, i didn't know thant information before 
, please check i will wait nothing can do.
It might also help if you can recall when project was created/deleted?
deleted : today at 09 December 2013, 13:49:55 (GMT+04:00)
created : i'm not sure but form 1 month (09 November, 2013 ).
Thank you! Do you remember app name? or it's the same as name of shared project?
Thank you Maryna, it had same name.
Hello! I'm sorry I have to tell you, but I'm afraid we're not able to restore deleted project with certificate you need to update your app version on Google Play. You registered on 2013-11-02, but the last Appery.io DB backup was created on 2013-10-30 and there is no your project...