Can power failure rollback mysql innodb database of many days?
I'm quite sure that the rollback was made by automatic Windows 7 System Restore after the power failure. This restored the mysql data folder. I cannot understand how a OS restore can move files from other applications even becuse I was using a custom path for mysql-data: c:\mysqldata and not the standard c:\programData\Mysql\....
My solution is to disabled the windows restore, but I think can be a better solution.

EDIT

The problem is the IBD data files of Mysql/MariaDB, these are a "monitored extension" and Windows rollbacks them anywhere in the volume. 

EDIT2

Seems that switching innodb_file_per_table option to OFF solved the problem because new tables (only new ones) will not use IBD files.