Wow. Also having migration issues. This is an interesting kind of infuriating. Worse than windows. After using Apple computers for nearly 40 years, having been taught to use Macintosh computers in elementary school, I’ve met my match. Nothing has been this confusing yet.
My ongoing issues:
Initially tried migration over WiFi. I set it up and everything went fine. I have a decent WiFi 6 router so the 3hr 22 minutes seemed about right for 200Gb. Went out, came back a few hours later and it read 3 hr 21 min. A couple hours later it failed with some odd error. Tried again and it failed. Cracked open the time capsule and put the hd in a Usb enclosure and it wouldn’t recognize it. Hooked my late 2018 air over tb in target disc mode and the M1, which has the same storage space, reported not enough space for the transfer. Rebooting the m1 I found the storage was somehow shrinking rapidly, so I disconnected the 2018 air and the storage was still shrinking. Again I had torn apart my time capsule so it wasn’t transferring from that. Decided something was corrupted and wiped the M1. Tried to transfer again in recovery mode (after finding out how to do this... it has changed) and it asked to unlock my source directories. Entering my password does nothing... no error and no success. I decided that I had to reinstall Big Sur and, as everyone but me knows apparently, it fails to complete. Failed to personalize OS X or something. What fun. Should have just used CCC.