I plan on getting an external hard drive soon to back up all of my data on, which is about 1.6TB at the moment for the drive I plan on backing up. After the initial backup, which I imagine will take quite a long time to do, will it be possible to update that backup without redoing the whole thing? This is probably a really stupid question, but I just want to make sure. So, for example, if a week after getting it I want to have it update any and all new or changed files, is that possible without manually choosing everything for it to back up? Thanks in advance!