I'm looking for an offsite backup solution for a company with approx 100 gigs on data growing by about 100 megs a day. They have a 1.5mb T-1 and about 500 gigs of available webspace (through Dreamhost). I would like to have an efficient offsite backup, possibly through nightly transfers of incremental backups. I'm not too keen on keeping continual incrementals as they make restorations lengthy, but rather I'm looking for a way to merge an incremental into an already existing full backup, an effect similar to what _rsync_ on *nix platforms. I've googled around looking for an rsync equivalent and haven't found much of anything.
Is there any software you've used that could fit the problem model I've described? Is this effectively done with ntbackup and ftp scheduling? What do you think?