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It would be nice, if duply could execute a script exactly before uploading the archive to the given URL.
(My current problem is, that I have to stop some servers for backup, but the could be restarted before uploading to S3, which is not so fast.)
what type of servers are you referring to? You can use dump tools for databses.
Duply wraps duplicity backup tool. What you request would have to be done in duplicity, you should feature request it there.
Alternatively you can consider to use duplicity only with the file backend and upload/rsync the result manually to your backend. Maybe utilizing the post backup script in duply. There are cmd line tools available to access s3.