Add question about saving the same repos in multiple places

Asked-in: https://archive.softwareheritage.org/admin/add-forge/request/847/

restored source branch archive-multiple-forges

Jenkins job DDOC/builds #635 failed .
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added 11 commits

• cb645134...8e4019c8 - 10 commits from branch swh/devel:master
• dcbfa168 - Add question about saving the same repos in multiple places

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Jenkins job DDOC/builds #662 failed .
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