There are a few reasons why many people would not (or should not) use Cyphertite:
* It's been such a long time in development and there's still no client for OS X. Building from source should be an option, not the only way, if this is ever meant for mass adoption.
* There's no information about accessing backup files from mobile devices.
* Most importantly, unless you have more than 100GB of data to backup, you're better off with the premium plan (enterprise segment) than the expensive personal plan where you would get a lot lesser in return.[1] I had pointed this out to them a year or two ago, but there's been no change and this structure does not make sense for the section of home users who may have only a few tens of GBs to backup.