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I am using duply to backup files/directories to S3. I want a full backup once a month, and an incremental every day in between. I also want to keep all backups for up to a month, but I don't understand how purging works. In the conf file, I have set the following variables:

MAX_AGE=1M
MAX_FULL_BACKUPS=4
MAX_FULLS_WITH_INCRS=4
MAX_FULLBKP_AGE=1W
DUPL_PARAMS="$DUPL_PARAMS --full-if-older-than $MAX_FULLBKP_AGE "

I have set the following command in my crontab:

0 0 * * * duply my-profile backup

and everything seems to be working. The first backup was a full one. The second and third where incrementals.

What I expect this to do is:
Take a full backup once a week, incrementals in between and keep only 4 full backups, none of them older than a month.

questions:

  • Is my assumption correct or is there something more I should do?
  • Do I have to do anything else for purging to work?
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