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Earlier today, I ran through my normal, weekly disk cleanup/maintenance/repair tasks for both of my Macs. I first started with Repairing Permissions (need to do that separately), then ran Onyx and Tech Tool Pro. Everything went fine, although it's still taking a good amount of time to 1) restart from Tech Tool Pro's eDrive, and 2) quit the eDrive and restart from each Mac's internal SSD. But the surprise came when I started to use SuperDuper! (the latest version, V3.1.1) for my backups. As I have mentioned before, I have two external Samsung 850 Pro 512 gig SSDs each inside nice, slim Orico enclosures, with the connection to each of my Macs being via USB 3.0. On each of those drives, there are 3 partitions: one is for my Mac Mini backup, one for my Mac Book Air backup, and the other contains other "stuff". Each partition (especially the ones for the backups) are more than big enough in terms of space allocated. Finally, each partition is formatted as Mac OS Extended (Journaled).
So, when I started SuperDuper! on each machine, after getting the source drive (the internal SSD on the respective Mac) "ready", it then Erases the destination drive (partition in my case), gets it ready, and then proceeds with the backup. For the Mac Book Air, this worked fine, as it always has. But, for whatever reason, when SuperDuper! tried to Erase the destination partition on the Mac Mini, it came up with an error, just saying it could not Erase the partition. Talk about being baffling! I never, never had this issue before, even when I was using HDDs. I then tried to Erase and re-format the partition with Disk Utility, again as Mac OS Extended. But then same error happened. And that was the case for both external drives! Meanwhile, each of the 2 backups for the Mac Book Air went perfectly. I was truly perplexed!
Then, I decided to try something: again using Disk Utility (the version that comes with High Sierra), I erased and re-formatted each of those two Mac Mini backup partitions, but this time formatting them as APFS. Well low and behold, that worked! The SuperDuper! backups proceeded like they always have.
So, I am just at a loss as to why the backups worked with the Mac Book Air, with its backup partition on each external SSD formatted as Mac OS Extended (Journaled), but for the Mac Mini, the two partitions for the backups (one on each device) needed to be formatted as APFS. And it makes it more perplexing as to where the "blame" lies: with SuperDuper! (latest version, V3.1.1), or High Sierra (latest version, V10.13.2) or both?
Next, though, is when I encountered something strange, and also more speed issues. I wanted to make sure that the Mac Mini backup would start up. So, as normal, when I started up my Mac Mini, I held down the Option key. In the past, as most folks know, what would happen is that a horizontal "list" of bootable devices would appear (and this happed while holding down the Option key until that "list" screen started to appear). But, for whatever reason, that does not seem to be the case with High Sierra. While continuing to hold down the Option key, I just had a dark screen. But when I finally released the Option key, then the "list" screen appeared. Next, when I selected that external Mac Mini backup device, it took a rather long time for the start up screen to appear, and then a long time for it to boot up. I of course was not expecting that boot up process to be as quick as when I boot each of my Macs from their respective internal SSDs, but this was definitely slower than with Sierra.
Similarly, after booting to that back up partition, I then wanted to go back to booting from the Mac Mini's internal Samsung SSD. Well, that "switch" also took a long time (just like with Tech Tool Pro's eDrive), both getting to that start up screen, and the start up process itself.
So, in summary, it is certainly clear that starting up, "switching" start up devices, or trying to restart from the internal device, all with High Sierra is definitely a slow, disappointing process. Not sure if and when it will improve, but definitely a bummer now.
So, when I started SuperDuper! on each machine, after getting the source drive (the internal SSD on the respective Mac) "ready", it then Erases the destination drive (partition in my case), gets it ready, and then proceeds with the backup. For the Mac Book Air, this worked fine, as it always has. But, for whatever reason, when SuperDuper! tried to Erase the destination partition on the Mac Mini, it came up with an error, just saying it could not Erase the partition. Talk about being baffling! I never, never had this issue before, even when I was using HDDs. I then tried to Erase and re-format the partition with Disk Utility, again as Mac OS Extended. But then same error happened. And that was the case for both external drives! Meanwhile, each of the 2 backups for the Mac Book Air went perfectly. I was truly perplexed!
Then, I decided to try something: again using Disk Utility (the version that comes with High Sierra), I erased and re-formatted each of those two Mac Mini backup partitions, but this time formatting them as APFS. Well low and behold, that worked! The SuperDuper! backups proceeded like they always have.
So, I am just at a loss as to why the backups worked with the Mac Book Air, with its backup partition on each external SSD formatted as Mac OS Extended (Journaled), but for the Mac Mini, the two partitions for the backups (one on each device) needed to be formatted as APFS. And it makes it more perplexing as to where the "blame" lies: with SuperDuper! (latest version, V3.1.1), or High Sierra (latest version, V10.13.2) or both?
Next, though, is when I encountered something strange, and also more speed issues. I wanted to make sure that the Mac Mini backup would start up. So, as normal, when I started up my Mac Mini, I held down the Option key. In the past, as most folks know, what would happen is that a horizontal "list" of bootable devices would appear (and this happed while holding down the Option key until that "list" screen started to appear). But, for whatever reason, that does not seem to be the case with High Sierra. While continuing to hold down the Option key, I just had a dark screen. But when I finally released the Option key, then the "list" screen appeared. Next, when I selected that external Mac Mini backup device, it took a rather long time for the start up screen to appear, and then a long time for it to boot up. I of course was not expecting that boot up process to be as quick as when I boot each of my Macs from their respective internal SSDs, but this was definitely slower than with Sierra.
Similarly, after booting to that back up partition, I then wanted to go back to booting from the Mac Mini's internal Samsung SSD. Well, that "switch" also took a long time (just like with Tech Tool Pro's eDrive), both getting to that start up screen, and the start up process itself.
So, in summary, it is certainly clear that starting up, "switching" start up devices, or trying to restart from the internal device, all with High Sierra is definitely a slow, disappointing process. Not sure if and when it will improve, but definitely a bummer now.