I'll definitely check out Backblaze, but the problem of slow upload is still there. It would take me months to upload everything. Having redundant storage locally isn't pointless however. Most people have one hard drive in their one computer and do sweet fuck all to back up their stuff. The first step in any backup scheme is hardware redundancy. The second step is offsite backup which I have to some degree with my dedi.
In the meantime I'm confident in knowing Spanish brick and concrete houses don't burn easily and I live on high ground. I live in a gated community and I have bars on all my windows. I also have a big black dog that makes most Spaniards piss themselves in fear when they see her. Plus I rarely ever leave the house, so meh.
whatever works man. My philosophy is that my life blood (code, design work, anything business related) takes precedence for backups, and images and everything fall second. I use spotify so don't care about music downloads, I stream or torrent all my movies, and photos I take I put into dropbox automatically.
As for business stuff, all my code is on github but is also on dropbox, so I would need a really really bad day to be high and dry (not impossible, but very unlikely). I also do a weekly time machine backup just for peace of mind.
As for fast uploads, you're most likely going to be limited by your own broadband as the services accepting your data will be almost always be able to download faster than you can upload. I have 20mb/s downloads here, but like 0.9mb/s uploads.
Just sign up and let that baby run at all times (or just at night if you need all your bandwidth). Once it's caught up, it's only incremental uploads anyways so won't be too big a deal for it to keep up with new stuff.