backup for SDHC cards?

maybe have a laptop on set plus an external harddrive to dump the cards to? i'm sure someone will have a more clever idea after the sun comes up.
 
regionally stores have different products, so why not to use google ?
as solution for lazy can suggest take a look worldwide chinese products : http://www.dealextreme.com/products.dx/category.310~search.OTG
Looks like very good devices but:

1. What is the transfer speed?
2. How many minutes to transfer 1gb from a SD card?
3. How many gigabytes can you transfer with one sole battery?
4. Does it support long filenames (or only short filenames 8.3 like in DOS) ?
 
each device is different and have own hardware/software limitations (as each chinese maker do own thing on similar base)

4. - think if that is used as for backup of sd cards from camera you have no difference.
3. depend on many factors such as power consumption of sd card, device to which you have transfer, and battery pack, there may be different solutions, persist devices with internal power on Li-Ion accus, AAA batteries, or external power supply, so simple search for similar products
2. normal devices approx 1-3 minutes
1. calculate from p.2

P.S. provided link was only as example - best possible solution you wil find at local stores (Nexto used by BrianMurphy - is one of that type devices).
 
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