hello, (I opened this forum because the others date back to some time ago and do not contain any information they do about it for me). Having said that, consider my situation: I have an nvme pcie 3.0 SSD where I keep the files useful for my work, they are files that I know I will reuse, on which I will work above, in addition to keeping us text editor software for programming and software for the design and the machine learning, then I have the external hard disk where I keep practically everything, everything that is on the SSD pcie 3.0, I will regularly have files of the SSD moved to the hdd because I do not reuse anymore I have all the data of my phone on this hdd, my phone backs up every week, and many things go to the Cloud. Having said that, how could I manage to make a backup that is comfortable for me, as systematic and orderly as possible, I would not want files to end up on one side and other files on the other, or worse still I would not want to lose them, which is important when I do them frequently will I have to make sure that these similar backups have to be overwritten? to avoid saturating the memory, if so I would like to be able to trace any backup made over time, not only the last, but also the first to the third to the penultimate Having said that, how do you advise me to do? how do i regulate myself?