text: Q:
  
  Can i have 400 snapshots in Amazon Ec2 if they are incremental only
  
  I want to know about snapshotting.
  Amazon says that they make
  
  Incremental backups
  Only charge for the data chnaged between snapshots
  
  Now my question is let us suppose the only data which change is only coding files which will only be few MBs every week even not that
  So does not matter if i have 1000 backups or 10 backups. because the differnce wont be there in any subsequent snapshots and i wont be charged.
  Am i right.
  I mean if i have 10GB snapshot of First data and suppose that stores full 10GB
  now let us suppose i take snapshots every hour and provided data does not chnage for one month.
  so i will be having    24*30 = 720 snapshots. Without any additional cost because data is not changing.
  Ami right or i am missing something
  
  A:
  
  Copy-on-write snapshots do not consume space unless their data has changed, which is why they are not going to charge you for the space.
  There will be meta-data that needs to be stored for the snapshot. This will be nominal, but I can't guarantee that it will be free. Also, it's virtually impossible to change nothing between two snapshots. Whether it's a log file being written to, or a ticker ticking over, etc. Something will be changing.
  However you really don't want 720 snapshots. What are you actually trying to achieve? EBS volumes seem to have a limit of 500 snapshots anyway, which also seems like a bad idea.
  
  