Yes, that will work. I do it, and have suggested doing that plenty of times here. And have used the backed up files to restore to a particular point plenty of times. You do need to be careful. Make sure you have copied everything. And when restoring, remove all the files from the device. And restore to the same firmware version that you did the backup with. It will probably be OK with a newer version of the firmware than the backup was done with, but, if you are having problems, you want to minimise the variables when trying to fix them.
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