Availability of indexed data

[chimbudp]

If i upgrade my Splunk to new version , my early indexed data will be available by default ?
Or i need to restore my backup copy to new instance ?

[sdaniels · Accepted solution]

It's always a good idea to back up your data before upgrading, but you will not lose your historical data when upgrading Splunk.

http://splunk-base.splunk.com/answers/64659/how-can-i-upgrade-splunk-from-4-to-5-without-data-lost