How to backup large databases or all databases on your server using just PhpMyAdmin:
1. Click the Export tab
2. Under Export, choose “Select Allâ€
3. Under Structure, only select “Add DROP TABLEâ€, “Add AUTO_INCREMENT valueâ€, and “Enclose table and field names with backquotesâ€
4. Under Data, only select “Complete inserts†and “Use hexadecimal for binary fieldsâ€
5. Check “Save as fileâ€, choose compression and click GO!