Differential backup
I am still confused! I run a full system backup every week and a differential backup daily (7 in all) before the next full backup. Do I need to keep all the intermediate differentials or do I only need the most recent one plus the last full one if I need to restore my data for any reason?


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Keep what you need/want - as each backup provides a point in time to recover from. If you are taking daily diffs, you can recover to that point in time, as long as you have them. You certainly can delete them (through the APP only!!!!! - use "cleanup versions" to do this), but each one you delete, removes a point in time you can recover from.
Example where this could be a problem:
You take a full. Next day you take a diff. You create an important document and that is captured in the next days diff. You delete that important document the next day, thinking you don't need it anymore. You take more backups and eventually get your next full so you go ahead and delete all of last weeks differentials to free up space. However, you remember that you need some information from that document now and want to recover it. Unfortunately, now you can't, because the backups that contained it were all deleted and it does not exist in the current full or the one that came before it.
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