Keep TexLive install after upgrade

[Leptopoda]

This is some sort of feature request. The setup guide for a full TexLive installs says we have to re download it on every upgrade.

What about using tlmgr backup to keep the installed packages somwhere on the system und re install them after an upgrade? On restore we could also install updates so the user wouldnt have to do this manually.

[3nt3]

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