If the restore is same size as SSD there would be know where to store any other files...
So no the restore should not be the same size as your SSD.
When setting system restore there are 2 options.
1. System restore will only backup system files and folders
2. System will make a back of system files and folders also user data
3. System restore will only keep restore points the size of the restore setting
and then will delete the oldest restore point and add the most recent it creates
4. I believe windows default is around 8 to 10%.
5. If you want to have more restore points you will have to create a larger
portion of the drive just for sake of it say 20% of you drive.
6. For everyone is different depending on size of drive you are storing to
and how may restore points you want to keep, remembers windows always deletes
the oldest restore point and creates a new restore point..
I have always usually keep around 8 to 10% but that is me. I do not need restore points that
are 2 or 3 months. If I am having problems with my system and need to go back to different date it
usually a problem with driver of software that I am having problems with 2 or 3 month old restore point will not help me.
Recently I have noticed a few on OCN not having large enough store points and lost data that was months old.
You need to have a good backup plan for your system and not count on system restore as sometimes it is finicky and
does not work. It works in a pinch but I would not count on it for day to day backups.
Hope this helps