I just moved about 50 websites and noticed that files with wrong ownership where not copied. For example sometimes I had a theme folder in WordPress wp-content/themes with ownershop root:root.
Transfersite did copy this folder even if I was running the command as root. This I OK if transfersite would have given a warning about it. Now I runned the command and everything look to be fine but the whole folder was missing.
Please do not muck around the system as root unless necessary. You’re one space away in the command rm -rf / my/path/to/files (or cd / ; rm -rf /path/to /subfolder/yadayada/ *) from restoring a full system image.
Files owned by root are deemed system files. These files likewise are not counted towards your quota, so it’s not an easy math problem to say quota on x is n and quota on y is m; n * .9 > m; therefore some files weren’t copied over. Worse yet, these files, owned by root, cannot be updated by the panel - so it’s effectively an immutable file within an account.
Always verify your migrations completed successfully.