I'm using X1 search 8.1.1 build 5001bc and this behavior continues.
I have the same challenge -- every time the file modification time is updated (multiple times a day), the file will be flagged for backup again which wastes backup bandwidth. The indexing frequency cannot be adjusted per file. For instance, on an old archive file, there's no reason to re-index it every 30 minutes.
I have the same challenge -- every time the file modification time is updated (multiple times a day), the file will be flagged for backup again which wastes backup bandwidth. The indexing frequency cannot be adjusted per file. For instance, on an old archive file, there's no reason to re-index it every 30 minutes.