I've been using Reaper (v5.15, recently upgrade from v4.75) for a while and up to now have found it amazing - but now I'm not so sure.
I've accumulated 12 Gigs of background files for tracks I have made using Reaper. After completing each version of a project I have saved it twice - on the desktop and on the remote hard drive. The latest version of my latest project has a RPP UNDO file of 320MB, which perhaps explains why it takes ages to load, longer to save, and I think it is slowing up responses to mods/editing(?)
I've tried backing up the undo files etc. for a project then deleted the originals to test but when open the project it says some files are missing and when I browse in the backup folder no files are shown. I've read the user guide until I'm blue in the face and am at my wit's end.
Just for information I run Windows 7 Home Premium 32 bit.