When selecting a mini backhoe, you must prioritize the engine brand and horsepower, typically ranging from 18HP to 25HP for mini models. Ensure the engine meets local emission standards such as EPA Tier 4 (USA) or Euro V (Europe). Key performance metrics include the maximum digging depth (usually 1.5m to 2.5m), bucket capacity (0.02m³ to 0.1m³), and operating weight, which affects stability and transportability. Additionally, verify the hydraulic system pressure (typically 16-20 MPa) and the quality of the main valve and pump, as these are the 'heart' of the machine's efficiency.