killerloop wrote:1) Synchronization to Dropbox and Backup to e-mail worked perfect.
But how to read the backup file on my PC?
Short answer : you can't sorry.
killerloop wrote:2) It would be nice to have iCompta on my PC too for reading the backup file and maybe do some adjustments or detail changes.
Do I have to buy and extra license for the PC?
Yes you would have too but PC version is not ready yet and is not likely to be any time soon.
killerloop wrote:3) I have different accounts in different currency... i.e. USD and EUR.
How to get different currency?
You have to enter your currencies in the Settings line from main screen and the you can set the currency of each account in the Account editing screen.