Backup shared Synology NAS drive with time machine

I'm switching to keeping all my work files on my Synology NAS and working on them mounted by SMB. I used to keep them in Dropbox but was concerned about security.

However, I find Time Machine and Dropbox versions really handy when a file corrupts or I need to go back a few versions.

Time Machine has my SMB 'Work' folder excluded from any backups and I can't remove it from the list.

Also, as I'll be removing from Dropbox is there any way to revert to previous versions through Mac OS, Time Machine or will snapshots on Synology do the job?