Backup my threads - Best way to?

Hi All,

I backup threads I'm interested in (usually the ones I initiated) by copying
them into shadow user folders I created in OE. Despite the fact that my
approach doesn't preserve the thread structure, I can still sense that
structure by viewing the shadow folders in date order. My primary purpose
is to prevent old threads from being automatically deleted.

While I could avoid the automatic deletion by un-checking that option, it
seems too wasteful of disk space. Is there a better way of backing up
selected threads?
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Regards,
Richard