The only time you might appreciate the speed of an SSD would be when making the initial backup (which again, runs in background anyway), restoring the entire machine from the backup, or using the backup to migrate to a new machine.Ī backup drive should be 2-3 times the size of the drive that's being backed up - Time Machine archives older versions of files and deleted files so that you can go back and recover them if necessary (you'd need similar with CCC, if you were doing incremental backups and/or saving an older full backup). There's no reason to use anything but a HDD - the backups are made in the background, so speed hardly matters. If you have a portable lifestyle, it's easier to get into the habit of connecting the drive every day when you get home than it is to remember to do that once a month. The fundamental problem with unscheduled backups (such as connecting the backup drive once a month) is that people don't get around to doing them. Why would you only backup monthly? Part of the point of Time Machine is to leave the backup drive connected (whenever practical) and let it automatically backup every hour.
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