After reading te book and alot of topics i decided to start my own "bucket" topic. Hope you don't beat me

Currently i used a year/date folder structure which is hard to backup to a external Medium (f.e. DVD). Before reading the book i broke my mind on how to backup to mediums like DVD. The bucket system seems to be perfect and i will change my method to a bucket system, after clearing some question :
- before adding something to the bucket i should add all metadata to the new photos it and rename the files, right? (otherwise it will hard to find the new pictures in the bucket)
- it doesn't matter what date/serie the image in a bucket is? f.e. if i decide to scan some old pictures, i just add it to the latest bucket, because there is no sorting done in buckets, but only by metadata. Did i get this right? ( it seems as if there is a chronological order in the book, because photoshootings are done in a chronological order, but what if i just start sorting and have no such order?)
- I saw some kind of subsorting of sets in those bucks (photoshooting names... or whatever). What if a buck is full before adding a set to the bucket? Do you split? - I will run into this situation, because i have scanned in tiffs, each folder of a set is 10-20GB large. (Bucketsize is DVD size)
... did i write to confusing?

Edit:
- how do you handle altered images? f.e. the derivative folder: what if you burn the derivated folder to a dvd an lets say in 2-3 months you alter the image again, do you add it to a new bucket?