How to make space/storage efficient backups of Raspberry Pi SD-cards

RaspberryPi mini computers are great for all kinds of home automation, media centers, home servers. Yet it should be known that the draw back for permanent operation can be the SD-card. Especially when applications on the RasperrbyPi cause excessive read/writes or if it is used outsides where temperatures can reach the SD-Card operating limits, IO errors should be expected that can just f* up the operating system.

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