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1. Follow the instructions here: 1&1 - Configure FileZilla with the 1&1 Configuration File
2. Once you connect with Filezilla, it'll ask you for a password. It's in LastPass as "1and1 SFTP (w/ Filezilla)".

Misc

• 1&1 does not offer a $1/month permanent plan. The guy I spoke with said that the cheapest plan typically works out to ~$130/yr.

Serverless architectures

• 2016.08.04 - MartinFowler.com - Serverless Architectures
  • long, looks helpful

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