I have a failed WD My Book Pro II and I'm looking to replace this enclosure with the Mercury Elite-AL Pro QX2 4-bay Hardware RAID enclosure.

If I move my two SATA drives (currently configured as a Raid-0) from the My Book to the QX2, will I be able to access my data?
And would it be possible to expand this existing Raid-0 when I insert a third drive?
And will I be able to convert the raid-0 to raid-5 as well?