The options available to you are dependent of the version of the Caska Unit you have (0401E or CN136). Of the two, the 0401E is the older of the two variants but as this is the model I have, it applies to the rest of the content below. (The CN136 has a few additional options i.t.o mapping software versions available but as I have checked these out in detail I cannot comment thereon)
Firstly, you cannot clone the SD Cards, irrespective of supplier or hardware version (I have tried).
My first SD Card "vanished" so to say, so the one I currently use was purchased directly from Planet Electronics. Whilst I was under the impression I was buying T4A maps, it seems I have something else... sort of like a T4A hybrid map. I engaged with T4A many times to attempt to upgrade, get new maps etc, but generally found them to be useless in terms of service and accurate information/instruction. What I have subsequently found out is that despite everything I have being branded as T4A (even the splash screen when loading maps on the unit all say T4A), I actually upgrade my maps using the NavTeq (naviextras) services and have done so on multiple occasions. Dependent on where I'm going, I update on average once every 2 years and it effectively works out to a few hundred buck per annum then. It's as simple as plugging your SD card into your PC, registering on NaviExtras.com, downloading the relevant software and following their instructions. Upgrades to the maps are substantially cheaper than those with dealer specific units from other manufacturers installed. My maps are currently up to date as are POI's and have a few additional features (i.e. 3D buildings, 3D terrain) installed to boot.
The maps are waaay more detailed than any other mapping software (excluding T4A and Open Source Maps) which leads me to think that it is in fact a T4A variant of the mapping data. For the most part, most of the gravel and two spoor roads I've been on both locally and in neighbouring countries are on the maps.
Yes, the unit's are old and as such not the greatest i.t.o performance (i.e. processing power) but I have found them to be more than adequate. The only thing that REALLY frustrates me in this regard is the inordinately long time it sometimes takes to establish an accurate fix. Sometimes as long as 7 - 8 minutes which drives me nuts. There are some features which I find are not working correctly which I really wish the did (like track logs, for some reason once the device powers down and up again, the old track log is removed so if I need to back track, I don't turn my car off). I also wish they had provided the capability to do route planning remotely (i.e. on your PC) because plotting an entire overland route with GPS co-ords on the unit itself is tedious at best.
For me, it works like a bomb though. Could it be better, hell yes but that's what's installed in my car so I make the best of it.
Images of my SD card attached as purchased from Planet Electronics many years ago.
(got it it)? i got myself the 2012 GLS EXCEED. - this is now my 3rd pajero - and maybe - hope not - my last. man, pajero's are just awesome vehicles.
- i hope there may be someone out there that has a copy or something i could use to make a copy? - any sugestions?
aghh cats - orraaity then - attached please find? 
(once in a Paj, Always a Paj)