It’s not a feature of RT that I generally use but it will add a version number automatically if the file name that is being saved already exists. This includes the pp3 file at that stage. The pp3 file will be associated with that version but I think that if the raw file is opened again later it will load the most recent pp3 file so the older one needs to be manually selected.
It also will load the last one used when a fresh raw file is opened. This is to help process lots of files taken under the same circumstances but it’s nvg for that style of processing. Most shots may need individual attention so applying the same processing pipe to them is unlikely to give the results that are wanted. The pp3 files can be saved though so if this form of processing is suitable one called say stage1 could be saved or say one to suit the initial steps needed on a particular camera.
I find myself generally selecting neutral profile each time a new raw file is opened. I don’t think that there is an option to make this happen automatically.
The GIMP is a different kettle of fish. Save in it’s own format and reloading it takes things back to where they were left. This is why it’s such a huge file.
Personally for versioning I prefer another application’s method. It has a save new version button. That saves and sets the new version as the current one. It also has save new file for renaming and the opportunity to make that current also overwrite without versioning it. In RT’s case all new version need do is save and version the pp3 file. I’ve never tried launching a pp3 file but would hope that it opened the associated raw file and applied it. It does version saved jpg’s etc
Unless another editor is going to be used on a shot there is no point in saving TIFF or 16bit PNG. TIFF is often used by conservators to account for future software changes. In other words that format will always be with us. Others such as some raw formats and others may not be. That includes the software that was used to produce a shot too.