Neat answers, Mac, I appreciate it very much.
So what is the difference between FAT and NTFS other than the name, and is it recommended to run XP on NTFS? If so, why?
What are the old files that it compresses? What is the purpose of it doing so and is there any reason why it should not do so?
Is it the same with a backup? What are the differences?
FAT32 is more for pre 2000/XP users, whereas the better performance of HPFS, standing for High Performance File System, and NTFS standing for New Technology file system, is quite an advance not least in the security and file size capability which it offers.
'Old files' are files that have not been accessed in a while. Compressing them takes up processor time and decompressing them when required does too, and the time taken to do so slows the system down.
Compress data files if you have to, I do, but don't compress any files on your System drive. (Take a look in Disk Management to see the System drive, usually drive C: )
Backups usually stay on the drive whereas the wise drive imager will image to data CDR(s) or data DVD(s) in case the drive fails and they have to re-install from scratch.