Have any of you guys used these cloud services purely as a backup? I'm aware that Dropbox is more like a Virtual/Online USB flash drive. I have read that symlink can be created and pointed to my photos to have it uploaded onto Dropbox. But I have this naggy feeling that if my Dropbox account was hacked, or there was a massive security breach, someone can delete the files on my Dropbox account and it'll disappear on my computer too. I was wondering if there are ways to circumvent this? Or what's the ideal way to use Dropbox as a backup solution?