Oracle 11g migration to AWS
1: Data Guard between x86 Linux and SPARC Solaris will not work (unless it is x86 Solaris), see:
Data Guard Support for Heterogeneous Primary and Physical Standbys in Same Data Guard Configuration (Doc ID 413484.1)
2: Same for RMAN, due to the difference in endianness of these hardware platforms. Even if the on-premise system is x86 Solaris, restoring a backup on different platform with same endianness is not supported (restore actually works, but recovery does not). Oracle allows building the standby databases with RMAN active duplication instead of backups in such configuration.
3: That will work, you should be able to manage less than2 TB in 2 days with this.
Q1: Most likely Data Pump, unless your on-premise is x86 Solaris.
Q2: It can reconnect and continue where it was interrupted.