deckstatic wrote:
I'm upgrading from my 2018 Macbook pro to the newest model; if I backup the old one to an external drive & then import it as a backup to the newer one, will there be any issues? thanks!
You are better off starting a new Backup for your new Mac to avoid complications.
If your new Mac inherits your backup history - Apple Support
https://support.apple.com/guide/mac-help/if-your-new-mac-inherits-your-backup-history-mh35732/mac
Time Machine is great when it works, not so much when it doesn't...
3-2-1 Backup Strategy: three copies of your data, two different methods, and one offsite.