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If the best way to protect your software and operating system from disk problems is to save an entire partition, on the other hand, the same process no longer works for backing up data because, since they change often, frequent backups must be made, and save them all when only a few have changed or been added since the previous backup, is useless, wastes time, and tires the disc unnecessarily. It is better to have a copy of this data, on another partition of the disk, on another computer accessible via a local network or internet, on an external disk, or even on an U.S.B key. In this case, the problem is solved in two steps: in a first step, we copy all the data, then, at regular intervals, the two places where the data are stored are synchronized, by copying new and changed data from one place to another; as we only copy what is new, the synchronization can be short, which allows to make this type of backup often enough to have lost almost nothing in the event of a problem on the storage media. You need software to do this type of backup, Windows doesn't do it by itself (it's not the job of an operating system). Which one to use? There is a problem there, because the stars of the download sites are large and slow. I use the Synchronizer program, which distinguishes source and destination. It only changes the destination.
So if you delete an element on the source, it will also be deleted on the destination during the next synchronization.
After each synchronization, source and destination are strictly identical.  It is written by Mathias Reynaud. His website is here. I recommand it. Synchronizer does not require installation. You can just copy it and launch it, and easily use it from removable media. Download Synchronizer - 1,28Mo -.  | |
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