Docker container using my boot drive even though I have my volume somewhere else

@JBinFla, assuming you are on linux; read up on tmpfs.
That basically creates a file system in RAM which you can mount and use as scratch space for Duplicati tempdir.

For example you can create this in /etc/fstab:

# <file system>  <mount point>       <type>  <options>           <dump>  <pass>
duplicati_tmp    /mnt/duplicati_tmp  tmpfs   defaults,size=32G   0       0

I have not used duplicati for a while so I do not know if there are any other cache items to take care of. This thread touches on that:

hth.

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