Because many years ago I used your fantastic service to amass a tracked music collection that has since been dormant on a no longer used XPp box, and because your music search facility is now existentially challenged I have two suggestions that might apply to your situation based on what little there is to glean from this thread:
Consider creating an Amazon (S3|EC2AWS|etc) AMI and allow others to replicate it to their own storage/instance. This would only cost you for exceptionally large AMIs, but ZERO for other people to replicate it to their respective accounts.
However this is my best understanding: speculation and not experience.
I only use Amazon S3, and Amazon Cloud Drive -- five gigs EACH free [assumes USA]
I had been looking for a way to use Amazon DevPay for selling the 'cost' of bandwidth for S3 downloads. I have given up.
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Alternatively, Dr3am H*st has a storage service that I am much much more confident will suit you. Create an archive of all the files (with respective directory structure), upload the archive to Dr3am H*st's "Files F0r3v3r" service, uploading costs you very little, each person pays one fee once to download from Dr3am H*st 'forever'. This is NOT a scurrilous 'free' file hosting company, but a reputable web hosting company. Company name- and service name munged as this is not an ad for them but a suggestion for you
Thanks for all the mod fish