docker-volume-backup

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Curly braces aid the interpreter to identify which part of a composed string is the variable part to expand, and what the string to concatenate to is. In the case of

${volume_name}-${date_suffix}.tar

it worked, because -, and . are not allowd in variable names.

Use xz compression Add proper file extension to tar invocations

Since we are currently missing any CI, have you tested your changes somewhere? ;)