I do that but like the convenience of doing it from the O/S. I thought I preferred the external as well until yesterday. The reason I want to do that is because when I tried doing a restore from the external it kept crashing. Seems my 32GIG card is flaky (as these cards can be) and I couldn't restore. I know it's the card because it restored fine from the internal SD. The internal ram, not being a "card" is much more reliable and now I am too skittish to use the external MicroSd for backups.
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