CobianSoft

There are being stored uncompressed as you wished. But I think, this works only for the zip method. DOn't remember if this is sued in 7z as well, but perhaps not.

Foe nr 2, you could just use an incremental backup.

If the backup fails, then a potential good backup hes been deleted so no. The backup will be done and THEN, if successfully, then and old backup will be deleted.

Will see what can be done.

I know but why to reinvent the wheel? (Badly)

If I had a penny...

Use drag and drop folks.

I can't guess what is going on there. There must be a reason.

Just uncheck Save empty backups