pretest: error with tlmgr and lz4 backups

[Norbert Preining]

On Fri, 01 Mar 2019, Karl Berry wrote:
>       * Don't rely on a working --rm [for lz4], and delete the
>         uncompressed backup tarball by a separate step after compression

svn r50190

hope it flies.

Norbert

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PREINING Norbert                               http://www.preining.info
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