Now to create a backup, in case I need to perform a full clean/wipe,
1. Launch ES File Explorer.
2. Press Menu button. Select Manager.
3. Select App Manager.
4. Long-press on Google Play Store. Select Backup.
5. Popup will appear stating Google Play Store_3.7.15.apk was backed up successfully (/sdcard/backups/apps/). Couldn't remember whether I'd set the path previously or not :P
Backed up apps will be highlighted in green?
It's really there!