[Feature Request] Pre-allocate files on destination to prevent heavy file fragmentation

[yoyokenny]

I use FFS to backup and restore the files for a rather large game that I play and FFS excessively fragments the files during the process, which causes the game to load extremely slow (bout 15 minutes). An option to pre-allocate the full file size before copying would prevent this (at least for an initial mirror job)

Apologies if this has been requested before, but I couldn't find anything through a few searches.

[Zenju]

Disk space has always been pre-allocated when copying files with FFS.