Add-On - SMS Backup & Restore.

2015年07月29日

v3.30:
- Added options to delete old backup files from Google Drive and Dropbox.
v3.20:
- Added support for GMail API so there is no need to enter the username and password any more.
- Old Gmail support renamed to "GMail (Legacy)"
- Better handling of large email send failures.

v3.13:
- Updated Dropbox SDK as per their guidelines.