where can i find out what replication methods my tap supports? specifically the

tap hubspot

and

target bigquery

You should find it in the repository. Personally I didnt use

tap hubspot

 and 

target bigquery

but seems that use a start_date to pulls data based on that date. https://github.com/singer-io/tap-hubspot

{
  "redirect_uri": "<https://api.hubspot.com/>",
  "client_id": 123456789000,
  "client_secret": "my_secret",
  "refresh_token": "my_token",
  "start_date": "2017-01-01T00:00:00Z",
  "disable_collection": false
}

tap-hubspot

seems to support incremental replication

Incrementally pulls data based on the input state

the default

target-bigquery

(adswerve) supports

truncate

and

append

. pipelinewise-target-bigquery on the other hand supports upserting, which imo is a better approach than either truncate or append. You'll have to add the latter as a custom plugin though.