As part of our backup process, Backblaze will run a checksum against each file before uploading it. This requires the entire bzfileids.dat file to be loaded into RAM. After a long time, or if you have an extraordinarily large number of files, the bzfileids.dat file can grow large causing the Backblaze directory to appear bloated. The only way to resolve this would be to repush (or reupload all of your data).
To Repush your files:
1. Uninstall Backblaze.
2. Go to https://secure.backblaze.com/update.htm and install a fresh trial.
3. Go to https://www.backblaze.com and sign in to your account. Click the 'account' tab and delete the old computer, this will delete this backup and free the license.
4. Then go back to your trial and click the 'already bought' button.
Recommendation for how to minimize your vulnerability.
You can install a trial on the 'new' machine and when the trial is almost fully uploaded, you can initiate the Transfer License.
Until you actually delete the license as shown in step 3, you will still be able to restore files from this backup.
One thing to keep in mind, as part of our best practices we recommend that users be able to upload their data in 30 days: Best Practices