A different solution for online backup is to use Jungle Disk. Jungle Disk is a software that utilize the Amazon S3 storage network which is very fair priced (approx $0.18 pr GB a month + an upload fee of about the same).
The solution has a quite good agent software (also comes in a USB version, so you can carry your online disk) which allow for scheduled backups, bandwidth throttling etc. etc. and the security seem quite convincing.
In the near future I will be comparing this with the www.Keepit.com solution, my feel for now is that Keepit is more home user aimed and Jungle Disk is usable for both, however the low FIXED price for Keepit do seem tempting.