Linux

Hi all,
I have a smaller nvme for my root and home partitions, and I wanted to upgrade to a 1TB. I have several drives on my machine and have been backing up in different ways. One way is I just copied all of my home folder and pasted it on one of the drives. Another way is I copied that folder to my NAS. I also have Pika backup setup to do automatic backups daily to one of the drives. My question is, how do I go about the process of restoring my backup with Pika? Do I reinstall the whole system, install Pika, point it at its old backup folder and have it restore? If so, what does it actually restore? Does it originally back up apps, their data and whatever I have in my home folder, then it restores all of that to the new system? Or does it only back my config files and home folder? Sorry if this is an obvious and dumb question, but I really don't want to do things from scratch since I've had this same install for a long time and I've set it up the way I like it.
Running Endeavour OS with KDE plasma. Thanks in advance.
P. S for this who wonder why I didn't separate root and home partitions since I have many drives It's a long story and it would be off topic and I don't want to bore you all with it.