Hi,
I live in the canary islands as an expat, on the island with the recent volcano, and I've been looking for a backhoe or excavator for 6+ years. I've traveled to other islands half a dozen times to look at machines and did a tour around the mainland of spain looking at many machines. My search area has included france, Benelux, and the UK.
We have some things in common that pertain to your search: remote location and limited technical knowledge of locals. I studied engineering, and I love being a shade tree mechanic. I do jobs here on the island as a mechanic (machinery, automotive, motorcycles, home appliances, etc) because local mechanics regularly screw up things as simple as oil changes (e.g. stripping threads in aluminum oil pans and then using epoxy to seal the drain plug and sending the client on their way. Changing a drain plug washer is unheard of here.)
Please allow me to share with you some of what I've learned (I'm not from here, because a typical person from here would never spend 30 minutes of their time to help another human being without there being something in it for them. As it pertains, I do miss living in the USA and the UK - on average FAR kinder people, far less selfishness.)
Nonetheless, here's what I've learned from reading hundreds if not thousands of hours (to the point of reading service manuals for machines I don't own!!!). I think I've watched half of the youtube videos that exist on repairing backhoes and and excavators. I've talked with small and large machinery owners in different countries, and have looked at machines myself. But I have never owned a machine, just operated a few and did some simple repairs to a few.
1. If you buy a backhoe you will need to increase your mechanical willingness to turn wrenches. As it pertains, what people have said here on this forum about buying used is, from one perspective, sound advice because of the lack of local competency where you are. Used (usually pre-2003) means simple. New is not always better because you will never have the tools or the time to diagnose 100s of sensors, kilometres of wire, and handfuls of computers on the newer machines. Buying new means a high-level of dependence on the dealer (and high €€€€€s long term). If it is new, after the first couple of years you will need an income stream to continue using the machine.
2. Keep in mind that there are different mentalities of how to use and care for a machine. This is important when buying a used machine. For example, in the canary islands, maintenance is nearly unknown. People don't attend to issues when things are wearing out. They wait for things to break. In other countries people upkeep their machines. The father of a friend of mine didn't think motorcycles needed oil in their engines. I've only ever known 1 machine owner to change the oil in the final drives. Whereas in the northwest continental Europe and in the UK there is more maintenance done. More contentiousness. It is even better in France. When considering buying a used machine there is a big difference between a machine that has some normal wear yet has been maintained and buying a machine where everything is just about to fail. I believe it was Carrero that stated in print at one point that their axles and gearboxes were designed for 12000 hours. They can last longer, but maintenance is important. Wait until it breaks is a social mentality in the canary islands, and mainland spain is only nominally better. Of course there are exceptions. I saw an amazing 18-ton Komatsu wheeled excavator in the mainland of spain with 12000 hours that looked and operated nearly like new. But keep in mind not the exceptions but rather the rules.
3. Brands: with your remote location you want to be focused on parts availability and dealer willingness (and cost) to ship them to you. In terms of brands you want to buy a machine, whether new or used, that has a local dealer. Note: Most of the forum members here are US-based and Komatsu is not as common in the US but John Deere is. The european Komatsu machines (with the exception of the early Fiat ones) I've seen have been very nice (smooth operation of the hydraulics, the engines seemed far quieter and smoother than all other brands). Also stay far away from Caterpillar "D" series backhoes in Europe I believe they were made in the UK. The US-made ones were fine but the european ones (428D, 432D, 438D) have horrible welding. I've never seen anything as bad. The absolute best used machine you could buy is probably a european Case 580SLE or 590SLE, made in France. Simple, extremely robust, great welding, will withstand continued demolition hammer use, and parts are still available. I've heard good things from people with the 580SM also but the 580SM came with the IVECO and not the cummings. Cat C-series are and also the earlier E-series seem good (though the E-series has computers). Older Cat machines come with perkins designed engines with replaceable liners, an advantage, as engine rebuilds are easy and can be done "in-frame). The cummings doesn't have removable liners but they seem to never die. I'd prefer to have a machine with a cummings (lasts forever) or yanmar (smooth and quiet). Some people like and some people don't like the JCBs but they seem to keep working; I rarely see dead JCBs here.
4. Governmental compliance. People are selling used machines in europe because they can no longer do public work with machines that do not meet certain emissions. The EU is just another manipulated governmental entity. And having read eu law here for ages I see the way they do things. First was tiered emissions compliance for new sales, then more and more public works were obligated to contract with requirements for emissions compliance. The next step is all contractors will need to use compliant machinery. The second to last step will be to outlaw the ability to use roads with machines that don't meet certain emissions compliance (either via manufacturers' statements or via inspections). The last step will be to make them illegal (akin to 2-stroke engines in waterways in the USA).
So, buying new means dependence on dealers and €€€€s but you will be able to use the machine to make some of the money you soend. Buying used may mean a more reliable long-term machine (if you can find a good one) but that it may be limited to just your property.
I wish you the best,
Dave