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EDITING THIS RESPONSE 12/26/14
I've recently learned that sites like mypcbackup that offer 'unlimited' backup space are misleading us. They do in fact offer unlimited backup space, but NOT on their personal plans and once you move over to the special plans where the unlimited space is available, it becomes REALLY expensive. As far as I have been able to tell from my research they all do this.
So here's what they do. They say for $100 a year or whatever you have unlimited backup space, but then when you hit a certain amount of space (in the case of mypcbackup, that amount is 816gb) you have reached your 'fair usage' limit. What's fair usage? Well it's their way of backending your storage space by saying well you've used an unfair amount of space compared to 99% of the rest of the users, so since you're not being fair to everyone else you don't get anymore unless you upgrade to a business account. In the case of mypcbackup, who advertises UNLIMITED space for around $100 a year on their personal plan, an upgrade to business plan costs $83 just to get a business plan and $5 per month per 100gb of extra storage space. So, lets say you're like me and you have 1.5TB in your music archives of masters you've made over the years and you want to have that all backed up. I'd need another 700gb, so the upgrade would cost me 83 + 12* (7*5) or around $500 a year. NO THANK YOU!
I'm not sure how these company's consider calling a plan unlimited when it's actually limited to 816gb FAIR, and going over 816gb UNFAIR, but you get the picture. It's flat out 'bait and switch' advertising and it's absolutely wrong. Like I said, it looks to me like all of the sites that offer unlimited space do this. If I discover a site that doesn't, I'll update this post.
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^ Makes sense Mike. Thanks for the response.
FWIW, a couple of months ago, I researched cloud storage services for backing up my masters and ended up going with myPCbackup, which so far I'm very pleased with. This service isn't a specialized music streaming site, but just for backing up data. I've been doing double harddrive backups at home for a long time, so this is a third backup location. I may drop back to only one home backup since cloud storage is also backed up. It's $100 a year for unlimited storage space. Other features of this site that I like are quick downloads and that I can share my files at the file, folder, or directory level.
I used to upload to two places; archive and etree. The problem with etree is it's torrent based and since most music I record is local and regional acts, the torrent dies pretty quickly.
However, I recently started a Facebook group for announcing and sharing my music...Funked Up (feel free to join if you'd like). I wanted someplace where people could permanently download shows that aren't on archive, so myPCbackup does that perfectly.
The only downside I'm finding to cloud storage like this is that, since upload speeds aren't nearly as fast as download speeds, it can take a long time to get files uploaded to your particular site, particularly the large 24bit FLAC masters.