Possible disk failures or raid card issue?

Looking for some advice. I have two unraid servers. One is the main storage one is for backups. I have been using rsync to copy everything from one to the other. I thought it was syncing the two. I didn’t know that its just coping everything from the one to the other. I had a bunch of extra iso that I updated. I ran the sync command with the command to delete the copies so I would have a complete sync. When I did that I lost most of the one folded of iso’s. it was if the drives were not there. I checked the main nas and it showed the files there. When I checked the shares the files were not there. I started the nas and everything showed up like nothing wrong. Maybe the raid card glitched? Now missing most of my one folder of iso I started coping back to the backup nas.

I am running into two issues. One drive is started giving error on the drive and unmount. I restarted the nas and the smart data showed no issues. I started to unbalance just in case because its going to take a fair amount of time to finish the backup. This way I am at least copying all the data off. Now that I am doing that I am getting a seek error rate on one of the other drives.

I have had no issues for months. Any other situation I would just pull the drive put a new one in and copy the data from the backup. Since I screwed my backup I am hoping to figure out the issues so I don’t have to redownload the isos.

The drive with the error has 3 years on time the seek error has 1 year. I can post the smart data if needed. Could it be an issue with the raid card? Should I order a new one?