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We're constantly choosing between "higher level" tools (like diskutil) or lower-level APIs (like the IORegistry) to accomplish our tasks. Much of that work is deciding what "level" you're going to interact at. It's one thing to depend on system features to perform necessary functions: after all, to be a good application, you need to build yourself on top of the APIs that Apple provides. So, during investigation, when we discovered how incredibly buggy and user-hostile it was, even when it started "working", we took the work we'd done to implement asr support and tabled it.
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If you've seen that WWDC session, you know that Apple specifically mentions the new asr capability as being perfect for "Backup programs", and we sort of looked at that as code for you're going to be forced to use this eventually. Sometimes the destination drive would be unreadable or unmounted.Īnd in all cases, it would fail.obscurely. Sometimes it would leave unmanaged snapshots on a volume. Sometimes it would leave unusually named volumes hanging around. And even when it started working, while fast, it dealt with failures.poorly. The new feature basically didn't work until Catalina's final beta. We were pretty excited about this new feature, until we actually tried to use it.
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For those in the US, enjoy Labor Day weekend!ĭuring last year's Catalina introduction, Apple's APFS session introduced a new capability: the asr ( Apple Software Restore) tool was now able to perform both APFS copies and, used appropriately, "delta" backups. I'll be back when we have additional news to share.
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If you must install it, use Time Machine for backups for now (and, given my advice in Practices Make Perfect (Backups), on a continuing basis in addition to other methods), since it's at a relatively equivalent Beta quality level to the OS itself and is explicitly tested and supported by Apple. These Betas, even when public, are not for general use, and certainly not for anyone who wants a reliable system for day-to-day work. In the meantime, my advice for macOS Betas remains as valid as ever: do not install a macOS Beta unless you have a critical business need to do so. So, while progress is being made, we're kind of stuck waiting for the king.
While asr was failing completely in previous builds, in the most recent one it isn't able to back up because the system volume isn't properly 'sealed' (which is ominous, since why wouldn't a standard install be sealed, and if it's not, why wouldn't you be able to back it up anyway).
So, for the moment, we're holding back, hoping that Apple will fix the issues and allow 3rd party (or even 1st party, given asr) bootable backups. As such, we haven't released a Beta, or even an internal Alpha, because it wouldn't meet our own requirements. I haven't said anything about Big Sur yet, and since the public beta has been out for a while, and I'm getting more questions about it, it's time.Īt present, it's not possible to make bootable copies of Big Sur, even with asr, Apple's own built-in replication utility.
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