Finally I get it working in the local test.

Thank you very much for this great script and your kindly support :)

Well, I tried with a fresh new copy like you suggest, and the previous problem dissapear. But now I have another error message, this one:

Specified archive directory '/home/samuel/.cache/duplicity/daedb76a93a9a5c65793185c65874bc3' does not exist, or is not a directory
Specified archive directory '/home/samuel/.cache/duplicity/daedb76a93a9a5c65793185c65874bc3' does not exist, or is not a directory

I can’t figure why is telling this, I tried to exclude that directory from the backup but it says the same even doing that :(

This is my script configuration:

# AMAZON S3 INFORMATION
export AWS_ACCESS_KEY_ID="my_access_key"
export AWS_SECRET_ACCESS_KEY="my_secret_key"

# If you aren't running this from a cron, comment this line out
# and duplicity should prompt you for your password.
export PASSPHRASE="my_passphrase"

# Specify which GPG key you would like to use (even if you have only one).
GPG_KEY="my_key"

# The ROOT of your backup (where you want the backup to start);
# This can be / or somwhere else -- I use /home/ because all the
# directories start with /home/ that I want to backup.
ROOT="/home/samuel/backups-mysql"

# BACKUP DESTINATION INFORMATION
# In my case, I use Amazon S3 use this - so I made up a unique
# bucket name (you don't have to have one created, it will do it
# for you).  If you don't want to use Amazon S3, you can backup
# to a file or any of duplicity's supported outputs.
#
# NOTE: You do need to keep the "s3+http:///" format
# even though duplicity supports "s3:///".
#DEST="s3+http://backup-bucket/backup-folder/"
DEST="file:///home/samuel/new-backup-test/"

# INCLUDE LIST OF DIRECTORIES
# Here is a list of directories to include; if you want to include
# everything that is in root, you could leave this list empty (I think).
#INCLIST=( "/home/*/Documents" \
#    	  "/home/*/Projects" \
#	      "/home/*/logs" \
#	      "/home/www/mysql-backups" \
#        ) 

INCLIST=( "/home/samuel/backups-mysql" ) # small dir for testing

# EXCLUDE LIST OF DIRECTORIES
# Even though I am being specific about what I want to include,
# there is still a lot of stuff I don't need.
EXCLIST=( "/home/*/Trash" \
	      "/home/*/Projects/Completed" \
	      "/**.DS_Store" "/**Icon?" "/**.AppleDouble" "/home/samuel/.cache" "/home/samuel/.*" \
           ) 

# STATIC BACKUP OPTIONS
# Here you can define the static backup options that you want to run with
# duplicity.  I use both the `--full-if-older-than` option plus the
# `--s3-use-new-style` option (for European buckets).  Be sure to separate your
# options with appropriate spacing.
STATIC_OPTIONS="--full-if-older-than 14D --s3-use-new-style"

# FULL BACKUP & REMOVE OLDER THAN SETTINGS
# Because duplicity will continue to add to each backup as you go,
# it will eventually create a very large set of files.  Also, incremental
# backups leave room for problems in the chain, so doing a "full"
# backup every so often isn't not a bad idea.
#
# You can either remove older than a specific time period:
#CLEAN_UP_TYPE="remove-older-than"
#CLEAN_UP_VARIABLE="31D"

# Or, If you would rather keep a certain (n) number of full backups (rather
# than removing the files based on their age), you can use what I use:
CLEAN_UP_TYPE="remove-all-but-n-full"
CLEAN_UP_VARIABLE="2"

# LOGFILE INFORMATION DIRECTORY
# Provide directory for logfile, ownership of logfile, and verbosity level.
# I run this script as root, but save the log files under my user name --
# just makes it easier for me to read them and delete them as needed. 

LOGDIR="/home/samuel/logs/test2/"
LOG_FILE="duplicity-`date +%Y-%m-%d-%M`.txt"
LOG_FILE_OWNER="samuel:samuel"
VERBOSITY="-v3"