Restore Google Drive revision
Right-click on the data.crypt file and choose Manage revisions...
Download older revision of the data.crypt file to your PC/Mac:
Upload the downloaded file back as a new revision:
Click the button "Upload new version"
Choose the downloaded data.crypt file in your PC/Mac
Open aWallet Cloud in your Android phone or tablet and press the synchronize button on the home screen. aWallet Cloud will download the restored revision.
There is also a video showing all steps done in Google Drive: