Some users may find that the application data folder of SpiderOak One or Groups grows to a large size. What you are seeing is its internal database. This is on each computer with the SpiderOak One or Groups application and stores metadata about (but not the contents of) the files in the associated account. Its purpose it to provide for fast browsing, offline browsing, and to aid in deduplication. The more data stored in the account, the larger the database will become. You can expect this to occupy up to 1% of the space occupied in the online backup account.
When files are being backed up, the size of the database will temporarily increase by the size of those files. The application turns those files into encrypted data blocks, which occupy temporary space in the database. During the time that files are being uploaded, the application will need an amount of disk space equal to the size of those files. Once those blocks are uploaded, the local copies are deleted and the database shrinks again. To accurately measure the size of the database, do so when One or Groups is completely shut down.
Over time any database can develop bloat. Whenever the application notices that significant disk space can be saved by cleaning the database file, it will do so. Although the application does a good job of taking care of this automatically, you can also trigger a manual cleanup at the command line if you wish with the --vacuum option.
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