Ok, so urbackup hashes and indexes the files that are about to backed up from one client and compares them with what’s already on the server.
But what about files within a client itself?
For example.
I’m backing up a client which gets used as a webdevelopment server by many users. This means that there are a lot of identical files in different places, e.g. every users wwww directory where they each have a copy of the project that they collaborate on. e.g. /home/user1/ProjectA and /home/user2/ProjectA
Those two directories have 99% of the same data. Is URbackup smart enough to only transfer unique data? Or does it only compare hashes between clients?
I tested this with some very large ISO and text files copied on the same client and then to other clients and the system ends up storing only a single copy of each.