You have your alf_data on your T: drive and the solr index is still pointed to the c: drive. If you don't change that in your postgresql directory then you will have two locations to backup:
1. T:drive alf_data 2. C:drive solr folder in your default alf_data folder
Start with editing the file that should be named ctl.exe (I'm sorry its named ctl.sh in linux which is what I use) you'll have to do some digging to find it. I have it located in linux at…
install/postgresql/scripts/ctl.sh
I also modified setenv.sh file to point the PGDATA to my separate location:
install/postgresql/bin/setenv.sh
I realize this is for windows, but you may have some luck if you find files that are similar to help you point to the new location.