I'm a tech guy, and "rolling my own" Linux solution is possible, but in this case, I'd be happy to pay someone else to worry about the details of storing a copy of my bits, so I can do other things with my time.
My wish list is as follows:
MUST
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have both Linux and Windows client
ability to whitelist/blacklist/select subsets of files/folders to be backed up
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SHOULD offer as many of the following as possible (all optional)
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some sort of "Family" pricing deal for multiple machines in one account
encrypted backups with consumer controlled key not necessarily given to service
option to switch out back end bulk storage infrastructure
"forever" file retention / restoration of old versions (charge me for storage)
user scheduled backups and/or don't bring client to crawl or saturate home line
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Feel free to add any replies with suggestions here which might be useful to others.
For my point of view, if CrashPlan found the home offering unsustainable from "abuse" of the "unlimited" feature, I would have much preferred them introduce a cap to the home plan at some "reasonable" value. They could have balanced the books, and saved 95% of their customers. Start rolling off oldest file version backups when you hit space cap and/or offer extra space at cost+profit. Done.