According to many experts how often should files be backed up

Weekly

Explanation:

It is advisable to always back up your data (files) every week or at least once in two week to be on the safe side.

Cheers

given the options, i would say your best bet is c. the modem supports up to 56 kbps, which is too low for video streaming. dial up modems use actual phone lines, which only can go up to 56 kbps as that's more than sufficient for traditional phone calls. this is also the reason why when a dial-up modem connects, you hear all those sounds. it's literally using the phone line to establish a connection.

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