I use duply (a simpler CLI front-end to duplicity) for doing encrypted incremental backups to S3. The only annoying thing is that duplicity uses an old version

I use duply (a simpler CLI front-end to duplicity) for doing encrypted incremental backups to S3. The only annoying thing is that duplicity uses an old version of the boto s3 library that errors out if your signatures tar file is greater than 5gb unless you add `DUPL_PARAMS="$DUPL_PARAMS --s3-use-multiprocessing "` to your duply `conf` file. Took me days to figure that out.