Question is in the subject... and here is why.
I had dropbox client on main disk (C:) and syncing on external USB drive (D:)
When drive was disconnected, the client assumed I deleted everything and done that accordingly.
Now, I am syncing to the main drive and (because of lost trust) backing up to external drive.
But main drive is SSD with limited capacity (smaller than my account).
Now I would like to start all files offline, so the backup software backs the up.
And after a period (day, week, month) the files would/should go online if not used.
Is that doable?