Upgrade RAID1 Disks with new larger disks

Hi folks. I'm wondering if there will be any problems with my disk upgrade scenario. I have a Dell 2850 with 2 drives in it in a RAID1 config. I'm going to be buying some new larger drives to allow for more space in the server. I want to take the existing RAID1 and image it over to a new RAID1 and expand the 2 partitions as well that are currently in the existing RAID. My question is whether there are any strange things I need to be aware of as far as the RAID arrays and their configurations go. I remember doing something like this before and losing the RAID information and never knew how I got it working. I plan on using Acronis Backup and Restore 10 to do this project. I was just going to put the two new disks in slots 2 & 3 which would make up a new RAID1. I would then boot to the boot disk and clone the 2 partitions that are in the RAID1 in slots 0 &1, extending the partition sizes during the operation. After that, I would move the 2 new drives from slots 2 & 3 and put them in slots 0 & 1. Removing the old drives from the server completely. I'd really appreciate information regarding this scenario. Thanks.