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purge point on external storage
I believe that purgeExternalRestoringPoints() has the same logic problems described in PR #183 . I'll try to implement/test this code when I have some time.
https://github.com/jxmx/backup/tree/fix/147/purge-external-storage
I think it should be this straightforward but I'm kicking off some testing to see how this behaves over time
I've applied this pull with my modifications and it's worked perfectly for the last few days.
Fixes #176
Please see Pull #219 which might help the review process.