1. TechBarber may have been refering to his memory, eg. to remembering to anticipate and swoop file to/from the designated "offline notebook". My brain also does not have the memory of an elephant ;-)
2. Word of caution regarding storing on SD card on phones, at least based experiences both my girlfriend and I have had.
2a. SD cards can and have failed, blocking or corrupting access to or syncing of content on that card.
2a.1 (On a related note, I'm not a techy, but if EN was syncing to an SD card when you have online acces and that card blows-up, might that corrupt the logs and data needed for EN to compete the first sync after the storage directories are lost or replaced. E.g. If EN compares file name, save date, size or other data to logged data from previous sync or the Master version of a file to determine if either file has changed and if or how to back sync, could it get fatally confused if either file or destination is corrupted? ) (I'm a bit like TechBarb
2a.2 I'm a bit like Techbarber, in that I am freakishly over-zealous about data integrity, control and security (not to suggest Techbarber as extreme as I am). Therefore, I don't trust most sync software and prefer to manually create my own back-ups, in multiple locations and in father-grandfather-greatgrandfather structures. I also hate to need to access something and not be able to do so, especially since that tends to happen when you need it most.
2b. I believe most auto-back-ups of mobile devices (e.g. verizon cloud, icloud?, Samsung cloud, etc.) may only back-up device storage (and perhaps only certain folders) and nothing on the SD card.