Let me tell you a story...
There once was a girl who used gmail. They told her she was nearly at her 15G limit (gmail, Google+, Drive etc combined) and would soon have to pay for the service. So, she did what anyone would do... checked her apps and dumped a whole wack of backup photos.
The next day... To her horror.... She found out...
That every photo for Google+, her website and blog were GONE! Poof.
She then had the choice of spending hours and hours and days and probably weeks replacing photos OR she could replace the few most recent and leave the rest.
Sorry for the photo-less pages everyone. I'll try to replace more soon. Moral of the story-- copy them and do the ebook you always meant to do to save the years of writing and memories. ;-)