It's my 3rd backup method. First is SN, then partial hanging, and then finally just a simple exit bag with helium.
It is indeed painless and accessible, it just expensive and i'm afraid that i fuck up something with the ventils and sealings.
Helium is good. You just need to make sure it has a high enough purity. Party helium cylinders nowadays often contain around 20 % oxygen to cut costs and to avoid people to ctb (on purpose or accidentally).
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