pretest: error with tlmgr and lz4 backups

[Norbert Preining]

Hi

On Sun, 03 Mar 2019, Johannes Hielscher wrote:
> Though the plain tars are of no use to tlmgr, they could at least be
> more helpful than no backups at all (in case of disaster/human
> interaction).

Ok, I added the code you suggested in svn 50211

Thanks

Norbert

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PREINING Norbert                               http://www.preining.info
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