I suspect that HP keeps extensive archive files, but I've never probed it, nor would I expect them to supply copies of hubs I've deleted. Theirs is not a storage service, especially for 'dead files'.
I haven't always done so, but I keep a copy of my most of my hubs on my computer & intend to back them all up. It's just good back-up policy.
It's a simple process: Highlight the whole hub (pictures & all), copy, paste it to a text page and save as a file in a folder on the computer. If desired, it's then easy to print them out as 'hard copies'.
I try to also back up those copies elsewhere, either on my external HD &/or on flash drives. I've been online a long time - since 1997 - & have learned 'the hard way' about backing up anything I want to keep. It's almost automatic with me.