I've considered options but, in the end, I've just yesterday ordered 12 cheap 4gb CF cards. Considering that I already own 1 CF 8GB and 1 memorystick 1GB, that's 57 GB. I can consider the daily "consumption" and if I really see that they are not going to last (unlikely, but possible) I will buy another 8GB card at the usual price for tourists
A solution would be to carry my laptop and buy two USB external discs. I gave this up because I don't want to check-in the laptop. Bringing it with me would take too much available carry-on space if I want to carry with me also some film cameras, tripod etc. Besides, I cannot make a decent total backup of my old Mac until I buy a Firewire external unit (USB external units are not bootable with my Mac). And without a proper total backup, I am not going to move my portable. So I should buy an external firewire unit, make the backup, leave it home, buy two "photographic" units and go with the portable and two hard disks. But that would limit the carry-on luggage a bit too much. I might put the tripod in the checked luggage, but that is a bit of a risk (steal and damage).
The external "image safe" solutions would have been nice, but in the end two of them would have been expensive.
The many 4GB cards allow a certain fragmentation of risk, are almost cheap if compared with other solutions, and somehow I will be able to reuse the cards in future trips. I will format all cards in my camera before use, and check correct functioning as soon as I receive them.
The film camera with the 15mm is not just a very very wide angle but is also very small and light (Voigtlnder Bessa-L, doesn't even have a viewfinder, I use the external viewfinder which comes with the lens).
I might bring with me some film camera but the idea is to walk light. The typical walk-around configuration would be digital + Bessa. An alternative configuration would be my Minolta X-700 with the 28-85mm plus Bessa, or plus flash. That would be to use some film as well especially in high contrast situation (if I get out near noon and know that I will be back during the afternoon, I might prefer negative film, if I get out for many hours I will just bring the digital with me).
I don't want to pass airport checks with tenths of film cartridges because I don't want to have problem with the occasional idiot at the gate. Some of this film would be 800 ISO and two-pass of X-ray might veil it (unlikely, but possible). And a full bag of film might induce X-ray operators into some sort of suspect, check the film at higher power, who knows. Again, that also would take carry-on volume.
I also want to carry a flash, an external lightmeter, possibly an external spot-lightmeter for nocturne film pictures with tripod. When I packaged everything I will see when too much is too much. Maybe I'll just simplify things a lot and go with only digital and tripod.
Thanks to all
Fabrizio