New question #289824 on Duplicity:
https://answers.launchpad.net/duplicity/+question/289824

I have had a problem that has haunted me for a long time: I setup a dropbox 
backup solution that worked fine, yet failed to work when ran from a CRON job. 
I finally figured this out and would like to either share this info with other 
users and/or ask for a work-around in future versions.

When connecting a dropbox account the first time, one is directed to the 
website to verify the account. Doing this, a dropbox token file 
(.dropbox.token_store.txt) is created in the user's home folder. As long as 
this file is present, the backup runs fine. When running as the CRON job, this 
is probably done from the root account. The root however, does NOT have this 
token file in it's root - so the back-end will try to redirect the user to the 
website to verify the access. This process fails, because the CRON job neither 
hat a tty input nor a tty output - generating the cryptic message "needs human 
interaction". This nearly drove me mad.

Would it be possible to create an option that will store this token file in an 
alternative location, used regardless of the actual user? That would facilitate 
this kind of setup (running as a regular user for development; running as root 
or special user from a CRON job). Without this option, behavior could be as 
present - so as not to break current setups.

regards, Menno

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