Consolidating TM backups from multiple drives

I had a 500GB external drive that was being used solely for TM backups. The directory of this drive became corrupted and the disk stopped mounting. I switched the TM backups to a different external drive temporarily. I have since repaired the directory in the original drive and would like to consolidate the backup files for the two drives into one location - on the original backup drive. When I tried to drag the individual backup files from the temporary backup drive into the directory on the restored, original drive, it told me that the folder could not be modified.
Long story short, is it possible to consolidate these files without causing a problem, and if so, how do I do it correctly?

Interesting discussion. I have to agree with the comment that using RAID can be very useful with Time Machine. For example, I am currently using a Lacie 4big Quadra 4tb in RAID 5 to give me plenty of extra space for Time Machine. The RAID 5 option means that I lose 25% of the total capacity but I can rebuild the entire RAID set from the remaining 3 drives with no data loss.
Furthermore, and as part of the question I was about to ask, I now need to double my capacity and I was planning to use a second Lacie 4Tb to accomplish this. However it appears that in order to do this and be able to use Time Machine, I will have to either buy a hardware RAID card in order to stripe the two 4Tb drives together, or use software RAID as provided by Apple's Disk Utility. I know see there are other utilities also, but my problem/question is this:
If I use Apple's Disk Utility to create a software RAID stripe over these two drives, which I know will work and will give me the double capacity in one logical volume that I need (and yes I know I will have to backup everything first to another location and put it back afterwards because Apple's Disk Utility insists on erasing the drives to create the stripe), what will happen if I have to restore from Time Machine due to an internal hard disk failure (boot disk) on the Mac?
Thinking that it is, after all, Apple's Disk Utility that is provided as part of Apple's Operating System, I figured I would call...... Apple! Well low and behold, guess what they told me? We don't support Software RAID. Even though we provide it in our own software utilities that come with our own operating system, we don't support it. Brilliant!
So, basically, my problem is this. IF my Mac internal drive fails, I would normally boot from the DVD, choose Restore from Backup and select my Time Machine disk. But of course since the information for the software RAID was stored on the boot disk that failed, it's not going to see my Time Machine drive. Does anyone know if there is a way at that point to launch Disk Utility, restore the RAID set for my Time Machine drive and then use it to restore from? If not, I think I'm gonna have to buy a hardware RAID card because there's no way I'm taking a chance on it.
Regards,
David.

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