[Solved]Database Migration from influxdb 1.3.1 to 1.6.0

I have to migrate influxdb databases from a server with influxdb 1.3.1 to a new server with influxdb 1.6.0
For that, i would like to use the following script

  1. backup of each database (one after the other) inold server
  2. restore of the database in process on the new server
    I do a test with the first db (a very litle db). No problem BUT in source server, i have 866752 values and in target, only 773777
    Has anyone an explanation ?
    Thanks in advance

OK, i answer by myself.
Stop using backup/restore and use now export(influx_inspect)/import.
It works well !
Thanks to all,