Change the base directory of a backup?

[kenkendk]

@drivetourist

Is there a way to tell Duplicati to back up a directory like /tank/.zfs/snapshot/2020-02-03 , but rewrite the paths to /tank when checking for changes in the db and saving?

There is no support for this currently. As @ts678 mentions this can be done with bind mounts. Something like this for each backup:

mkdir /tankbind
mount -bind /tank/.zfs/snapshot/2020-02-03 /tankbind
duplicati-cli backup ...dest... /tankbind
umount /tankbind
rmdir /tankbind

The only difference between using the full path will be that Duplicati will be able to re-use the metadata from the previous paths, such that it does not need to re-hash the file to see if it has any changes.

@drivetourist

You could definitely do some bind mount or chroot trickery, but this feature would just be a string replace on the file path before it’s uploaded or written to the DB. Now, that doesn’t mean it’s easy to add…

It would be fairly easy to add (I think) but it is a wormhole of options and trouble to allow users to define a list of rewrite rules. Do you have an idea for how you would like to specify the rewrite rule on the commandline?