Offsite backup, BUT without local copy of the data (with catalog)?
wmf: I don't quite understand the use case. Do you want to backup data and then delete the local copy? I think that's more like archiving than backup, and it's not clear to me what "incremental" even means in that case. Or do you intend to keep your 1 TB of live data, but you don't want the backup tool to use any additional disk space?Speaking of catalogs, I wonder if Duplicity is what you want.