My 2019 Macbook Pro is going in for a repair/service job - On apple's site it advises me to make a time machine backup to ensure the safety of all my files etc... I have already copied all my important documents, Logic Pro X projects, photo library onto an external ssd? I guess what I want to know is if it's absolutely essential for me to have to buy a larger ssd and do a time machine backup before it goes in for service (which is for a fan issue, I doubt the ssd or entire Mac will need replacing) and is there anything a time machine backup would save and just copying stuff over to an ssd wouldn't? It's going in tomorrow and now I'm getting worried!