So my situation is as follows: I'm using BackInTime (which uses rsync) to run full, incremental backups of my 3 TB drive to another 3 TB drive. I've done such a full backup once and have around 100GB of free storage space on the backup drive. Now I moved around many GBs of files on the drive I want to have backed up and also renamed some files and directories.
What would be the best way to create a new backup / update the existing backup without having to first delete the old backup to free up space?
I don't think that BackInTime recognizes that files or directories have been moved or renamed, does it? (Maybe it will support this at some point?)
I only need one snapshot / backup. So the old one should get deleted somehow during the backup. But I'm not sure how BackInTime could do that. The Auto-remove option If free space is less than... might be relevant here. In the case that BackInTime here needs to delete some backed up files in a way that causes some files currently on my drive not being backed up I'd like to keep that amount minimal and if possible specify unimportant directories.
I'm using Debian 9 with KDE and the EXT4 filesystem.