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how much space my data will take up after compression and deduplication Valid point. You can use tarsnap's --dry-run option (along with --print-stats) to find

how much space my data will take up after compression and deduplication Valid point. You can use tarsnap's --dry-run option (along with --print-stats) to find out how much space your data will take up; unfortunately you need to have a key file before you can run that, and you can't create a key file until you've created a tarsnap account and added money to it. I will be adding a mechanism to allow people to run "keyless" dry runs so that you can install tarsnap and find out how much space your data would take before you spend any money.

gjm11 11y ago
Excellent! Would I be right in thinking that, if the storage cost is small enough not to bother me, then the bandwidth costs are extremely unlikely to be a problem?
- cperciva 11y ago
  The bandwidth used to upload data is going to be around 1% more than the size of the data (protocol overhead). So to a close approximation the cost of the bandwidth for uploading is going to be the same as the cost of a month of storage.
  - gjm11 11y ago
    That's for the initial upload, right? (And then incremental updates should typically be much smaller.)
    - cperciva 11y ago
      Yes. (Although even with incrementals, until you start deleting data your total bandwidth usage to date will be roughly the same as your current monthly storage.)