Hi,
Skins are stored into:
/usr/share/enigma2
You should find a folder with the name of your skin.
But be careful that some skins add some python component too, so just taking a backup of this folder is may be not enough.
But if you have the .ipk of your skin, the easy way is to reinstall the .ipk.
If you want a skin to be added into a the OpenPLi please provide us with the git (github, gitlab,...) address of the skin.
You should also know that skins are the main reasons for green screen so it is important to use the latest version of the skin and the skin creator needs to follow the image evolutions.
Pr2
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