I will add just this little bit.
As with any type of Software..
it's a good idea to have a backup, in case something goes wrong during the update.
most of the time Updates work as planned. but sometimes, a lost connection, corrupt data, and the update does't work as it is supposed to..
So making a backup of the card, before you update is not such a bad Idea.
If All goes well. you can get rid of the backup..
If Something goes wrong, Then you have the backup.
Yes, it's an extra steps to do..
and it is up to you to manually do it..
but not such a bad idea...