Overcrank with SxS then copy to MxM

I haven't been reading too many posting over here lately so maybe this has been already discussed. Lately I have been shooting a lot of overcranked (60fps) footage and run into a problem that my two SxS cards have been filled up very fast. If you don't have your computer next to you, you can always copy that material from your SxS card to MxM and format the SxS card and use it again. Slow, but still very usable way when your computer is not available.

Anyway, I wanted to ask has anyone lost footage by using this method?
 
I don't have this in mind because I overcrank at 48fps and my MxM allows this without errors... but it would be interesting to know how to select several clips in my SxS card to copy them to MxM, instead of doing it one by one.

Is this possible? I think it has been discussed before but I can't remember...
 
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