Encrypted cloud backup app for BB10 in development...
Look out for FireChest which should be available in June/July 2013. It's a very slick native app for BB10. You can select any of:
Contacts
Calendar
SMS
Individual folders (Documents, Photos, etc)
and the app will first ENCRYPT the data and then upload to your DropBox account. Restoring is just as easy. Say you've wiped your phone. Just install the app and enter your DropBox username and password, wait for it to connect and check for backups, and then select what you wish to restore. Easy.
If you've got any feature requests or ideas, send them to me.
PS. I was developing the app for my own Z10 but thought I might as well make it public. Also I am sick of software (os, e-mail, cloud, backup etc) that has no respect for privacy. Privacy policies mean nothing - look at the new CISPA bill that's just been passed in the USA. Encryption should be standard and unassailable in the digital world.