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Update 2: PPAs on Launchpad can be used for distributing packages for the x86/amd64 architectures. Other architectures are usually only available for the core team. As @saiarcot says, ARMhf builds can be made available for public PPAs on request: You may request an ARM build on your PPA if Your build takes 4hrs or less to build You have less ...
If you are talking about saving specific debs for other machines for offline install use dpkg-repack but if you want an offline repo for your own use there are ways of doing that (though not an area of my expertise) and it takes up maybe a terabyte at most.
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