The short version of our results: I don't care which option you use, just back up! Now! Seriously though, it's interesting to see Dropbox as a backup solution. Yes, it does versioning, but I guess I've never considered it a backup. Perhaps I'm too old.
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Clonezilla 19.6%
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Dropbox 19.3%
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Other 19.1%*
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Bacula 8.8%
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rdiff-backup 7.7%
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CrashPlan 7.5%
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Back In Time 5.4%
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Amanda 4.5%
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luckyBackup 4.1%
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Tivoli Storage Manager 1.8%
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Symantec Backup Exec 1.4%
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Storix .5%
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Areca-Backup .4%
*Popular write-ins: BackupPC, Deja Dup, SpiderOak, duplicity and rsync + tar/btrfs/ftp/cron/and so on.