Possible to back up (offline) mobile data collected on mobile devices

We have field staff collecting large data sets without connectivity in the field for extended periods. Is it possible to make a backup of the data collected daily to mitigate the risk of lost or stolen devices between sync opportunities? Sometimes they are far from a data centers and can't sync daily.

I was thinking PC via USB or bluetooth connectivity or OTG flash drive (or anything else suitable)

Thanks!

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