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mmmm You do the incredibly, I know for some, difficult thing that is looking at the notification area to see the progress of your backups! If it fails, and does so a few times, perhaps exclude a few apps and back those up as APK's instead, try the ones that store most or all data on the cloud. You can clearly see the notification that says "backup failed" or "XX/XX apps backed up, click here to see more." If no notification, then assume failure. I just wrote a guide based on very successfully using it for over 6 months for you. Try following it before you write off what I also think is you only option maybe?
That does sound SO trying, and so tedious though, Because it's not iOS-easy. Maybe you should have stayed there if you wanted 100% easy-peasy and didn't want to figure out how to put some of your own effort towards making things works for you? ALL the excellent root backup apps that are terribly effective, that people compromise the security of their phones over take a lot of effort and time to learn how to use correctly, because they are powerful tools! Security (and what do you think those 12 words at the beginning are about? It's you encryption password for backups!) and Privacy take A LOT of work! And no one else will do that for you! On iOS you never deal with your own encryption key, Apple has them from what I remember... I had an iPhone 13 Pro Max myself just over a year ago. That's much worse security and especially privacy than holding the key phrases in your own hands, and making local backups. Want redundancy? Initialize more USB drives!
Myself, I don't even need to deal with Seedvault if I don't want to! Yesterday I lost the keys to my Seedvault backup, and thank God that I build GrapheneOS from source and I always make two builds each update. One regular one and one with KernelSU modified into the kernel giving me full root privileges with a locked bootloader and therefore maintaining full verified boot. I can switch between rooted and unrooted without needing to unlock the bootloader so no data loss! All I needed to do was sideload the rooted OTA update and load my backups into Neo Backup, Swift Backup and App Manager (AM hasan excellent root mode, trying to build it into my fork of GrapheneOS as a system app). That way I got everything restored in 30 minutes without touching Seedvault!
So... If I can do that at will, why do I bother with Seedvault at all? Because it's a really good app, good at what it does once you know how to work with it! That and nothing else gives me back homescreen icons and system setting the same way. Sure I can backup and restore the system apps Contacts Storage, Bookmarks, Emergency Information, and others, but NOTHING else does it all as seamlessly as Seedvault! With D2D backups now, I don't think I'll need to use anything else. Which is amazing as I am trying to cut down and eliminate my root usage. Even with a locked bootloader ( usually rooting is unlocked bootloader only) it is a major security risk and is to be avoided as much as possible.