The backups get little actual use, and while drives go stale on the shelf too, my experience is that this allows me to avoid most long term problems. Three years is when most drives experience a rise in unreliability. I’m certain it required changes to the M1’s startup process and to asr to finally make it happen. That way, I continually replace drives with bigger ones over time, while ridding myself of older drives every three years. Dave Nanian of Shirt Pocket Software announcing that SuperDuper can now make bootable backups of Big Sur Macs, including on Apple silicon: To be clear, this is only possible because Apple made it possible in macOS 11.4. Just give the disk image a name and point it at your backup drive and all files will go into the disk image, completely accessible and completely separate from everything else on that drive. When time comes, every three years, to replace those internals with new ones, I clone a newer, faster, and large drive with SuperDuper, and put the backup drives as the primary drive in the machine. The magic words here are 'back up to a disk image.' When you select the destination in SuperDuper one of the options is Disk Image. When I do use any of them, I do an incremental backup using SuperDuper. Since I don't use what's in each drive on a regular basis, I don't use Time Machine for them. These are all large drives, and the way they're organized, I have backups for each drive. But I have a number of internal drives in my 2009 Mac Pro. I also use it on my Macbook Pro music server, and its external music library. Now-a-days, I use Time Machine to back all my start-up drives. SuperDuper has never had any problems that affected the clones, or incremental backups. The option can be chosen to enter your own script. Choose the script from the list of Standard Scripts: Backup all files, Backup user files, and Restore all files. While I have used the others for several years, both had some occasional problem or other that could prevent your clone from booting. How to backup MAC using SuperDuper: Open SuperDuper Set the target drive that you want to backup and the destination drive where you want to create backup for MAC. Over the years, I've used the other two programs.
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