at my last plant before they moved it to another state and let me go,
I was responsible for all the plc, rsview, panelview, interface modules program storage on the plant network.
we stored everything on the plant network and gave numerous people read access. Only one other person really made major changes, I was the one who had write access.
when we needed to modify the program, we had the following procedure.
copy the file to the laptop
open the file and then save it as program name-date (today's date)
make the program modifications
go to the plc and open up the current plc program.
save the program to the pc (it's the master file) as program name and today's date.
do a file compare to make sure the programs match.
download the program you modified
debug and change the program if needed.
save the program as program name - date
the technician would then send me the program so I could put it on the network.
this worked great with only minor issues.
if your pc has the only copies of the plc program, you need to have another storage location in case your hard drive died.
james