Where do you want to back them up to? If you are saying you want to copy them to your phone, but you don't have enough space, then you need to buy a bigger SD card. You could also save them to your PC/Mac.
Note, you do a normal tourist visa as well, but you have to re apply each time. And for METV, you usually have to show some proof of your general travel plans.
, you cannot stay in Thailand that long on exemption and tourist visas. But with the multi entry tourist visa , you can leave and re enter as often as you want up to 2 months at a time (3 if you apply for an extension).
If you don't want to leave, you will have to look at other long term visas, like retirement.
Depends. Starting now to the end of next week in Pattaya. Gets busier every day. Pattaya I believe has beach concerts or something. They usually extend the water activity longer than everyone else.
These days, you will have more luck solo, if you are renting a condo, and your name is on the lease. Otherwise, Agents are becoming more and more the only solution for many.