Restore started on my new phone now that the USB-C cable arrived. Hope this works. 🤞
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Well, looks like there's a nasty misfesture. If the phone goes to sleep (screen turns off), the restore aborts. My backup didn't have this issue.
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Hmm... looks like adb restore does absolutely nothing, and doesn't even give an error message.
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It looks like you can force a restore by installing the apk and then doing a restore. I did manage to get an application restored with it's data.
It may be that many/most of my apps are old.
android.stackexchange.com/questions/1695
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Lol, just noticed the comment in SO:
Command adb restore are not install .apk back. Actually, this command is only write back system and data files. -Android dev site
adb help says:
adb restore <file> - restore device contents from the <file> backup archive
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It will install the apk if you used -apk when generating the backup, otherwise it will only restore data for applications that are still present. It also won't restore if the application signing key doesn't match, you would need to edit the backup to bypass that security feature.
Apps can disable backups or limit it to a subset of their internal data since it would be broken to do it in some cases. For example, Signal disables it for security reasons and it wouldn't be able to work anyway since the database is encrypted with the hardware-backed keystore.
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Shame there isn't a way for the new device to export it's public key so that the old device could export encrypted backups to it.
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I did not experience that the application restored despite me using -apk on backup. I had to extract the apk and manually install it as a separate step like in that SO.