What percentage of storage can you archive?
By default we calculate cost saving estimates with the assumption you can move 100% of the current storage to another storage tier.
If this isn't the case, what percentage could you move?
What level of access do you need?
Archive services like AWS Glacier trade off cost for speed of access. If you can wait for access you can save money.
Wait times can be between 1 minute and 12 hours.