Absolutely pedro.1234,
I have always in each different folder made a backup folder called, "bckup," or whatever you fancy. To backup a file, simply add to its name. For example, let's say I have a battle.lgp. I would rename it to battle.back1.lgp.
Do this to every folder except the ones you do not want. Copy whole entire folders for the smaller files and rename them to backup folders with the original name still in their names.
Your save folder is located in the main directory folder. If your directory is
C:/Games/FF7/
then the folder called "save" would be in that folder. If you organize your folder alphabetically, you will see the "save" folder next to the "plugins" folder and the "shaders" folder.
So, just so you know which files and folders are important to back up, I made you a list, number one being the highest priority, number two not so high as number one, exceteri...
1. The "Data" folder's contents...
A. battle.lgp
B. char.lgp
C. flevel.lgp
D. ff7.exe
E. world_us.lgp
F. menu.lgp
G. kenel.bin
H. kenel2.bin
I. Window.bin
J. magic.lgp
K. FF7Config.exe
L. ff7_opengl.cfg
M. save00.ff7 - save09.ff7
N. crash.ff7
O. scene.bin
P. chocobo.lgp
Q. high-us.lgp
R. snowboard-us.lgp
S. condor.lgp
T. coaster.lgp
U. sub.lgp
V. audio.fmt
W. audio
X. cr_us.lgp
Y. moviecam.lgp
Z. disc_us.lgp and so forth...
Backup what you feel is not bugged or needs to be backed up. If you have a Mod folder with certain images that you have edited, then definitely backup these mod folders and files.
This is just my opinion concerning everything I have told you here. I am not an expert programmer or modder, though I wish I was.
Be sure to check out the pre-made saves made by Eslava at this webpage:
http://forums.qhimm.com/index.php?topic=8880.msg115218#msg115218If you already have done this, then that was good. If you have not, please be careful not to accidentally replace your current save files with these pre-made ones.
PitBrat's Bootleg Configurator is a God-Send. Have you used the "bootleg00038" yet?
Let me know if you have any further questions.