I have started to use SugarSync – File Sync & Online Backup.
Access all your data anytime, anywhere, from any device. Now get your own Personal Cloud! File sync and online backup for all your devices including PC, Mac, iPhone, iPad, Android, BlackBerry, and more!
SugarSync gives we what I need in terms of online backup and file sync, between computers, iPad and iPhone. So far I’m on their free account (4.24 GB) but will upgrade when needed.
SugarSync’s online backup, file sync, and sharing service makes it easy to stay connected. With SugarSync you get secure cloud storage for all your files — documents, music, photos, and videos.
I used Dropbox before but after their security claims fell to pieces I decided to switch.