[motyar]

Not an expert but here is what I do:

1. Dropbox for all the read-only ( Images, PDFs, Books, important papers).

2. I use IFTTT to autobackup a specific folder (very imp one) from Dropbox to Box.

3. Something I need to edit, like spreadship or docs. GoogleDrive works very well.

4. I keep most important files on atleast two services.

5. IFTTT works great to collect data automaticaly.

Edit: Goodlooking line breaks inserted.