Replicating our disk image to a NAS inside our home network took around six times as long as over USB 3, and if you want to upload your images over the internet, you can expect a very long wait indeed. This leads us to the key shortcoming of the full-disk approach: it’s not ideal for remote backup. All of this means that a 2TB external drive should be able to accommodate a complete system archive dating back months or even years. If you need to save even more space, you can configure filters to exclude superfluous files and folders – once you’ve made that initial image, you can build incremental backups onto it, so subsequent updates will be far smaller. ![]() We tried backing up a Windows system disk containing 141GB of data, and were impressed to see O&O DiskImage Professional squeeze it into a 72GB image file. Inevitably, full-disk backups take up more space than selective ones, but they’re less weighty than you might imagine, as a lot of the files in a Windows installation are highly compressible. Plus, of course, if you’re hit by a malware attack or an OS failure, you can boot into the O&O recovery environment – the program includes a wizard that will write it to a bootable USB flash drive or ISO file – and roll your entire system back to an earlier state. ![]() ![]() Doing it this way ensures that nothing gets inadvertently missed out of your backup set, while finding and recovering files is a breeze, as your backed-up disk image can be mounted and browsed directly within the Windows Explorer. ![]() It’s an approach that encourages you to make regular backups of your entire system, and that’s not a bad idea.
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