(Sorry for my English but i'm French and i don't speak very well English).
I will make a DIY Nas with 2x2Tb for storage disks in Raid 1. When i fond better finance i will extend my storage space with one or two over disks.
In order to extend the storage with a maximum of size, i will probably choose a raid 5 system.
Is there a way to grow raid from a raid 1 to a raid 5 system without loosing data?