[Duplicity-talk] Simple multi-generation backup

[Felix Natter]

Dear duplicity community,

I would like to set up a _simple_ multi-generation backup using duplicity
to a cloud service:

- target $CLOUD/daily/: backup once per day, keep last X
- target $CLOUD/weekly/: backup once per week, keep last Y
- target $CLOUD/monthly/: backup once per month, keep last Z

My daily script (to be called by cron job) looks like this:

duplicity --encrypt-key KEY --full-if-older-than 5D /repos $CLOUD/daily/
duplicity --encrypt-key KEY remove-all-but-n-full 2 $CLOUD/daily/

And my weekly cron job would call this:

duplicity --encrypt-key KEY --full-if-older-than 3W /repos $CLOUD/weekly/
duplicity --encrypt-key KEY remove-all-but-n-full 2 $CLOUD/weekly/

and so on for the monthly backup.

Q1: Is that a valid/good way to do it?

Q2: I tried to make a daily backup. Then I added a file /repos/bla.txt, then
made a daily backup. I removed it and made another daily backup.
Then I tried to restore /bla.txt from the backup:

duplicity restore --file-to-restore /bla.txt $CLOUD/daily /tmp/bla.txt
# (I tried -t 1D/2D/3D as well)

but it couldn't find it in the "daily" backup, so I guess that duplicity
only looks at the last full/incremental backup of the set in $CLOUD/daily.
But I need to be able to restore a file that was deleted a few days ago.

I think I am misunderstanding things, could you please point me to good
documentation?

Many Thanks and Best Regards!
Felix

--

SIDACT GmbH
Simulation Data Analysis and
Compression Technologies

Felix Natter
Software Developer

Auguststraße 29
53229 Bonn
Germany

Phone	:   +49 228 5348 0430
Direct	:   +49 228 4097 7118
Email	:   felix.natter@sidact.com
Web	:   http://www.sidact.com/

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